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www.tntextbooks.in, , GOVERNMENT OF TAMIL NADU, , STANDARD TWO, TERM - II, VOLUME 2, MATHEMATICS, ENVIRONMENTAL SCIENCE, , A publication under Free Textbook Programme of Government of Tamil Nadu, , Department Of School Education, Untouchability is Inhuman and a Crime, , 2nd std Maths II-term_Cover.indd 1, , 25-06-2019 19:26:24

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www.tntextbooks.in, , Government of Tamil Nadu, First Edition, , - 2019, , (Published under New Syllabus in, Trimester Pattern), , NOT FOR SALE, , Content Creation, , The wise, possess all, , State Council of Educational, Research and Training, © SCERT 2019, , Printing & Publishing, , Tamil NaduTextbook and Educational, Services Corporation, www.textbooksonline.tn.nic.in, , II, , 2nd std Maths II-term_Cover.indd 2, , 25-06-2019 19:26:24

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www.tntextbooks.in, , INDEX, S.No., , Page No., , 1, , Geometry, , 1.1, , Properties of 2D shapes, , 1, , 1.2, , Identification of objects by blind folding, , 5, , 1.3, , Identification of objects by observing the, shadows, , 9, , 2, , Numbers, , 2.1, , Comparison and formation of numbers, , 10, , 2.2, , Ordering of numbers, , 14, , 2.3, , Number name, , 20, , 2.4, , Addition upto 99 with regrouping, , 25, , 2.5, , Subtraction upto 99 with regrouping, , 33, , 3, , 2nd std Maths II-term_Index.indd 2, , UNITS, , Patterns, , 3.1, , Block patterns, , 40, , 3.2, , Patterns in shapes, , 43, , 25-06-2019 18:11:38

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www.tntextbooks.in, , UNIT, , 1, , Geometry, , 1.1 Properties of 2D shapes, Travel Through, Ask the students to form a circle by, holding their hands. Then call any three, students to act like lamb, sheep and fox., Make them play the game as follows., , Keyword, , s, , ape, Open sh, hape, Closed s, , No, no, no. We, Yes,, yes,, yes., It, is, won‛t give way., I am the fox. I want, very, safe, inside., Close, close, close., to see the lamb. Did, Can you open the gate, you see it?, and give the way?, , I am the sheep., Did you see my, little lamb? I am, searching him for, a long time., , Yes, yes, yes. Give way for, me to enter, inside., , Yes, yes, yes., Here is the way, open for you., , Teacher‛s Note:, Teacher narrates the story of sheep and fox to enhance the usage of the words such as close, and open., , 1, , 2nd std Maths II-term Unit_1.indd 1, , 24-06-2019 12:45:32

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www.tntextbooks.in, , Learn, , Properties of 2D shapes, , Let us learn the properties of 2D shapes., Square, , This stamp is in, the shape of a, square., , Square is a closed, shape. Square has, four sides., , It has four, corners., , All the four, sides are equal., , Rectangle, , 50 rupees note is, in the shape of a, rectangle., , Rectangle is a, closed shape. It, has four sides., , It has four, corners., , Opposite sides, are equal., , Triangle, , Traffic signal is, in the shape of a, triangle., , Triangle is a, closed shape. It, has three sides., , It has three, corners., , Sides can be, equal or unequal., , Circle, , Coin is in the, shape of a circle., , Circle is a closed curve., , 2, , 2nd std Maths II-term Unit_1.indd 2, , 24-06-2019 12:45:32

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www.tntextbooks.in, , Practice, Write “C” for closed shapes and “O” for open shapes in the, given space., , Draw open shapes of, your choice, , Draw closed shapes of, your choice, , Complete the table., Shape, , Number Number, of sides of corners, , Tick () one of, the statement true for, the shape, All sides are equal., , Name, of the, shape, , All sides are, unequal., Opposite sides are, equal., Opposite sides are, unequal., It has three sides., It has four sides., It is a straight line., It is a curved line., 3, , 2nd std Maths II-term Unit_1.indd 3, , 24-06-2019 12:45:32

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www.tntextbooks.in, , Try This, Observe the shape in the geoboard and draw as many similar, shapes of various sizes in the dot sheet given on the right side of it., , Teacher‛s Note:, Teacher can facilitate children to form 2D shapes in geoboard using rubberbands., , Think Like a Mathematician, Can you form a circle using rubberband in a, geoboard?, 4, , 2nd std Maths II-term Unit_1.indd 4, , 24-06-2019 12:45:32

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www.tntextbooks.in, , 1.2 Identification of objects by blind folding, Recall, Join the dotted line in each of the given figure and write ‘H‛ for, horizontal line, ‘V‛ for vertical line, ‘S‛ for slanting line and ‘C‛, for curved line., , Teacher‛s Note:, Teacher can extend this activity and ask children to discuss the other types of lines, observed in each of the given figures., , 5, , 2nd std Maths II-term Unit_1.indd 5, , 24-06-2019 12:45:34

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www.tntextbooks.in, , Travel Through, The teacher blindfolds one of the students and asks, him/her to take an object and identify the objects by, asking questions based on the properties as follows., Teacher : Is the object in your hand flat or round?, Student : The object is ___________., Teacher : Now feel the sides. How many sides it has?, Student : It has ___ sides., Teacher : Are the sides equal, say yes or no ?, Student : _____., Teacher : Can you guess the shape of the object now?, Student : It‛s shape is _____., , Keyword, , s, , Cube, Cuboid, Cylinder, Cone, Sphere, Circle, Square, Corner, Edge, Curve, line, Straight, , Teacher‛s Note:, Teacher should provide opportunities for all children to familiarize the properties of, different shapes., , Learn, , Tracing curved lines, Trace the outline of your, fingers., , Keep a bangle on a paper and, trace its outline., , 6, , 2nd std Maths II-term Unit_1.indd 6, , 24-06-2019 12:45:35

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www.tntextbooks.in, , Pleasure time, Join the dots and form the shape., , Learn, , Tracing straight lines, , Run a pencil along the box to draw Take a ruler and run a pencil, the outline of the shape., along its side to get its shape., , 7, , 2nd std Maths II-term Unit_1.indd 7, , 24-06-2019 12:45:36

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www.tntextbooks.in, , Practice, ii) Draw the outline of the, river and the cloud using, appropriate colour pencil., , i) Using a ruler, draw straight, line path to help the frog to, have his food., , Pleasure Time, Tick the lines found in the alphabets and numerals., Alphabets, and numerals, A, B, , Horizontal, line, , Vertical line Slanting line, , Curved line, , R, C, H, I, J, K, 0, 3, 5, 6, 7, , 8, , 2nd std Maths II-term Unit_1.indd 8, , 24-06-2019 12:45:37

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www.tntextbooks.in, , 1.3 Identification of objects by observing the shadows, Learn, Look at the shadow of the girl in various positions., , Teacher‛s Note:, Teacher can discuss the size and position of shadows formed. Help the children to observe, and discuss about shadows., , Practice, Circle the correct shadow of the given objects., , 9, , 2nd std Maths II-term Unit_1.indd 9, , 24-06-2019 12:45:37

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www.tntextbooks.in, , UNIT, , Numbers, , 2, , 2.1 Comparison and formation of numbers, Recall, , Compare the numbers, , i) Colour the bigger number in each of the given pairs., 26, , 60, , 38, , 59, , 30, , 50, , s, Keyword, Biggest, Smallest, Bigger, Smaller, , 96, , 72, , 69, , 96, , ii) Tick the smaller number in each of the given pairs., 15, , 37, , 25, , 34, , 60, , 50, , iii) Connect the number which is equal to the given number in each, of the given groups., 56, , 62, 26, , 29, , 65, , 65, , 99, , 36, , 26, , Learn, , 99, 69, 96, , Biggest and smallest number, , (i) Let us compare the given two-digit numbers., Take the numbers 20, 70, 90, Here, 2 tens is less than 7 tens and 7 tens is less than 9 tens., So, 2 tens is the smallest and 9 tens is the biggest., 20 is the smallest number and 90 is the biggest number., 10, , 2nd std Maths II-term Unit_2_Numbers.indd 10, , 24-06-2019 12:49:24

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www.tntextbooks.in, , (ii) Let us compare the numbers which have same digits in the tens, place 25,23,26, Here the tens are equal. So we compare the ones. 23, 25, 26, Among 3, 5 and 6,, 6 ones is the biggest and, 3 ones is the smallest., So, 26 is the biggest number and 23 is the, smallest number., (iii) Let us compare the numbers which have different digits in, both the places 25, 31, 40., Though the digits in ones place are different,, it has no significance in the comparison of numbers., So, it is enough to compare the tens place: 25, 31, 40, 4 tens is the biggest and 2 tens is the smallest., So, 40 is the biggest number and 25 is the smallest number., Practice, Circle the biggest number., , Box the smallest number., , i), , 34,, , 35,, , 39., , i), , 70,, , 20,, , 10., , ii), , 30,, , 80,, , 50., , ii), , 89,, , 82,, , 85., , iii) 41,, , 79,, , 19,, , 48., , iii) 35,, , 43,, , 17,, , 29., , iv) 62,, , 54,, , 76,, , 67., , iv) 59,, , 51,, , 15,, , 57., , v), , 57,, , 63,, , 36., , v), , 19,, , 96,, , 69., , 75,, , 91,, , Choose the correct answer., 1. 85 is the biggest number among, (i) 90, 74, 85, , ., , (ii) 60, 85, 58, , 2. Among 50,40,18 and 71 the smallest number is, (i) 18, , (ii)71, , (iii) 50, , ., , (iv) 42, , 3. Among 62,45,75 and 52 the biggest number is 62., (i) True, , (ii) False, 11, , 2nd std Maths II-term Unit_2_Numbers.indd 11, , 24-06-2019 12:49:24

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www.tntextbooks.in, , Formation of two-digit numbers, , Learn, , Take 2 sets of number cards., One set from 0 to 9 and the other set from 10 to 90., Call 2 children to take one card from each set and form a two-digit, number., Formation of two-digit numbers without repetition of digits., Let us consider the two-digit number 45. To form this number, we, need to select the cards 40 and 5 ., Let us consider the two-digit number 54. To form the two-digit, number 54 (digits interchanged) we choose the cards 50 and 4 ., , 40, , 5, , 50, , 45, , 4, , 54, , Formation of two-digit numbers with repetition of digits., Let us take the example of forming the two-digit number 66., Here we need to select the cards 60 and 6., , 60, , 6, , 66, , Ask other children to take different set of cards and to, form various two-digit numbers with and without repetition, of digits., Practice, Form different two-digit numbers using the number cards given, below. One is done for you., Formation of two-digit numbers, with repetition of digits, Tens, Tens, Ones, Two-digit numbers, 30, , 70, , 90, , 30, , 3, , 33, , Ones, 1, , 6, , 2, , 3, , 7, , 9, 12, , 2nd std Maths II-term Unit_2_Numbers.indd 12, , 24-06-2019 12:49:26

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www.tntextbooks.in, , Formation of two-digit numbers without repetition of digits, Tens, , Ones, , 30, , 1, , Two-digit, numbers, 31, , Tens, , Two-digit, numbers, , Ones, , Try This, Take 2 dice and throw them., Note down the two-digit numbers, (with and without repetition) formed., For example, if the numbers seen, on the face of the dice are 2 and 5,, then the different ways of forming, two-digit numbers are shown., Face, Numbers, , Two-digit, Numbers, , 2,5, , 25, , 52, , 55, , 22, , Biggest Number Smallest Number, , Using the given numbers, form all possible two-digit numbers and, complete the table., Numbers, 9,2, , Two-digit, Numbers, , Biggest Number Smallest Number, , 1,7, 8,3, 6,9, 0,6, 13, , 2nd std Maths II-term Unit_2_Numbers.indd 13, , 24-06-2019 12:49:26

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www.tntextbooks.in, , Pleasure Time, Complete all possible two-digit numbers (with and without, repetition of digits)., 5, , 6, 8, , 6,8, , 5,7, , 6, , 7, 5, 7, , 8, , 2.2 Ordering of numbers, Keyword, , Travel Through, , s, , g, Ascendin, order, ing, Descend, order, , Kavitha arranged her toys in an order as shown below., Guess the order of her arrangement., 1, , 2, , 4, , 3, , 14, , 2nd std Maths II-term Unit_2_Numbers.indd 14, , 24-06-2019 12:49:28

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www.tntextbooks.in, , Learn, , Arrangement in alphabetical order, , We can arrange the names of things in alphabetical order., , Cap, , Doll, , Gift, , Apple, , Egg, , Ball, , Fan, , Alphabetical order: Apple, Ball, Cap, Doll, Eggs, Fan, Gift, Practice, Arrange the given things in alphabetical order and fill in the, blanks., , Kite, , Jar, , Eraser, , Cup, , Lock, Book,, , Gum, , Book, , Fish, , ,, , ,, , ,, , ,, , ,, , ,, , Teacher‛s Note:, Teacher can extend the above activity for different objects., , Try This, Write the names of your classmates in strips. Arrange them, in alphabetical order., Teacher‛s Note:, Teacher can guide students if two or more names begin with same alphabet., , 15, , 2nd std Maths II-term Unit_2_Numbers.indd 15, , 24-06-2019 12:49:35

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www.tntextbooks.in, , Learn, , Ascending and descending order, , Ascending or increasing order, The bananas are arranged by counts., , 1, , 2, , 3, , 4, , 5, , The numbers have been arranged from the smallest to the biggest., This order of arrangement is called ‘Ascending order‛., Descending or decreasing order, , 5, , 4, , 3, , 2, , 1, , The numbers have been arranged from the biggest to the smallest., This order of arrangement is called ‘Descending order‛., The oranges in the plates are arranged by counts. We can arrange, the plates according to the number of oranges in them., , Ascending order: 5,7,9,10., , Descending order: 10,9,7,5., 16, , 2nd std Maths II-term Unit_2_Numbers.indd 16, , 24-06-2019 12:49:36

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www.tntextbooks.in, , Practice, 1. Count the given things and write them in the boxes. Arrange, in ascending and descending orders., i), , Ascending order, Descending order, ii), , Ascending order, Descending order, 2. Write the following numbers in ascending and descending order., i) 9,5,7,3, Ascending order, Descending order, ii) 4,12,15,17, Ascending order, Descending order, iii) 8,6,10,3, Ascending order, Descending order, 17, , 2nd std Maths II-term Unit_2_Numbers.indd 17, , 24-06-2019 12:49:38

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www.tntextbooks.in, , Learn, Arrange the given numbers in ascending and descending order:, 34,67,84,27,49., To arrange the given numbers in ascending order, let us look at, the digits in tens places 34,67,84,27,49 and arrange them. 2 tens, is the smallest among these and next is 3 tens followed by 4 tens, 6 tens and 8 tens. So,we can arrange the numbers from smallest, to the biggest as given below., 84, 67, , 49, 34, 27, , c, As, , e, , in, nd, , 67, , g, , De, , sc, , 49, , en, , 34, , din, , g, , 27, , Ascending order = 27,34,49,67,84., To arrange the numbers in descending order we arrange the, numbers from biggest to smallest., Descending order = 84,67,49,34,27., Practice, Write the numbers in ascending and descending orders., i) 12,24,35,17,9., , ii) 39,70,44,86,71., , iii) 94,81,90,70,69., , iv) 73,54,87,17,42., , 18, , 2nd std Maths II-term Unit_2_Numbers.indd 18, , 24-06-2019 12:49:38

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www.tntextbooks.in, , Activity, , Classroom activity, ,  Take cards with numbers written from 0-9.,  Divide the class into two groups. Three children from one group, take cards with numbers. Say 3, 2, 5 and make as many two-digit, numbers as possible.,  The next group of children shall arrange the numbers formed in, ascending and descending order., Try This, Fill in the flowerpots using given numbers only once., 72,17,88,15,93,10,60,53,21,44,39,78,65,49., i) Write the ascending order of numbers beginning with 21., , 21, , ii) Write the descending order of numbers starting with 88., , 88, , 19, , 2nd std Maths II-term Unit_2_Numbers.indd 19, , 24-06-2019 12:49:39

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www.tntextbooks.in, , 2.3 Number name, Recall, Count and write the number and number name for the given aquatic, creatures., , Complete the given table by writing the number and number names., Beads, , Number, , Number, name, , 1, , one, , 2, , two, , Beads, , Number, , Number, name, , 11, , eleven, , 20, , 2nd std Maths II-term Unit_2_Numbers.indd 20, , 24-06-2019 12:49:49

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www.tntextbooks.in, , Learn, Read and write the given number names., Beads, , Number, , Read the, number name, , 10, , ten, , 20, , twenty, , 30, , thirty, , 40, , forty, , 50, , fifty, , 60, , sixty, , 70, , seventy, , 80, , eighty, , 90, , ninety, , Write the, number name, , 21, , 2nd std Maths II-term Unit_2_Numbers.indd 21, , 24-06-2019 12:49:50

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www.tntextbooks.in, , Number name 21-30, , Learn, , To learn to write the number names from 21 to 99. First, we, shall familiarize number names from 21 to 29. As we know the, numbers 21, 22 and so on upto 29, all have 2 tens and different, ones. These numbers are formed by adding 1, 2, 3 and so on upto, 9 with 20. Hence we shall write the number names as follows., one, twenty, thirty, forty, fifty, , two, three, , 21 twenty one, 22 twenty two, 23 twenty three, , four, , 24, , five, , 25, , sixty, , six, , seventy, , seven, , eighty, , eight, , ninety, , nine, , 26, 27, 28, 29, , We can write number names for numbers upto ninety nine using, the above example., Practice, Write number names from 30 to 99., 30, , thirty, , 35, , 31, , 36, , 32, , 37, , 33, , 38, , 34, , 39, , thirty seven, , 22, , 2nd std Maths II-term Unit_2_Numbers.indd 22, , 24-06-2019 12:49:50

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www.tntextbooks.in, , 40, , forty, , 50, , 41, , 51, , 42, , 52, , 43, , 53, , 44, , 54, , 45, , 55, , 46, , 56, , 47, , 57, , 48, , 58, , 49, 60, , 59, 70, , sixty, , 61, , 71, , 62, , 72, , 63, , 73, , 64, , 74, , 65, , 75, , 66, , 76, , 67, , 77, , 68, , 78, , 69, 80, , 79, 90, , 81, , 91, , 82, , 92, , 83, , 93, , 84, , eighty four, , fifty one, , seventy five, , 94, , 85, , 95, , 86, , 96, , 87, , 97, , 88, , 98, , 89, , 99, , ninety five, , 23, , 2nd std Maths II-term Unit_2_Numbers.indd 23, , 24-06-2019 12:49:50

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www.tntextbooks.in, , Try this, i) Complete the number names., 75 = seventy, , 79 =, , 82 = eighty, , 88 =, , eight, , 41 =, , one, , 35 =, , five, , 93 =, , three, , 60 =, , ii) Write the number name for the numbers in the sports T-shirts., , 84, , 19, , 91, , 27, , 76, , 55, , Pleasure Time, Write the numeral and draw the beads for the given number names., Number name Numeral, , Beads, , twenty five, , thirty six, , forty eight, 24, , 2nd std Maths II-term Unit_2_Numbers.indd 24, , 24-06-2019 12:49:51

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www.tntextbooks.in, , 2.4 Addition upto 99 with regrouping, Recall, Add the following two-digit numbers and verify your answer, using abacus., , +, , +, , +, , T, 3, 3, , T, 3, 4, , T, 6, 2, , O, 6, 1, , O, 2, 4, , Take 36, beads in, the abacus., , Take 32, beads in, the abacus., , O, 0, 0, , Add 31, beads to it., , T O, , T O, , 3, , 6, , +, , O, 5, 0, , 6, , 7, , Add 44, beads to it., , We get, 76 beads., , T O, , T O, , 3, , 7, , 2, , T O, 6, , T, 7, 1, , We get, 67 beads., , T O, , 0, , T O, 7, , 6, , T O, , 5, , i) 33 + 41 =, , ii) 52 + 27 =, , iii) 63 + 24 =, , iv) 44 + 33 =, , v) 35 + 23 =, , vi) 32 + 27 =, 25, , 2nd std Maths II-term Unit_2_Addition.indd 25, , 24-06-2019 12:51:15

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www.tntextbooks.in, , Travel Through, , Blow, Pick and Add, , Agaran, Kuralini, Ezhisai and Agilan played, ‘Blow, Pick and Add‛ game, using tamarind seeds by forming two teams. Each of the players in, the teams were given three chances. Players seperate the tamarind, seeds from the heap of seeds by blowing and pick only the seperated, seeds by counting them. While collecting the seperated seeds if it, touches the other seeds then the player looses his chance and the, next player get the chance to play., , Number of seeds picked by each of the players is given in the table., Team, A, , B, , Name, , Chance 1, , Chance 2, , Chance 3, , Agaran, , 15, , 33, , 29, , Kuralini, , 9, , 37, , 34, , Ezhisai, , 14, , 23, , 26, , Agilan, , 16, , 38, , 37, , The team which collects maximum number of seeds are declared, as winner., 26, , 2nd std Maths II-term Unit_2_Addition.indd 26, , 24-06-2019 12:51:16

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www.tntextbooks.in, , Learn, , Add using seeds, , What is the total number of seeds collected by team A in chance 1?, Team A consists of two players Agaran and Kuralini. From the table,, in chance 1, the seeds collected by them are 15 and 9. So, let us add, 15 and 9 using beads, followed by the procedure for addition., Take 15 seeds and 9 seeds as shown below., , Ten, Ones, Seperate the seeds into the groups of tens and, ones. Seperate 15 seeds as 1 tens and 5 ones., Take 9 seeds as 9 ones., We add ones, we get 14 ones., , 14 Ones, , O, , 1, , 5, , +, , Step 1: Add ones, , 1 Ten, , T, , 9, , T, , O, , 1, , 5, , +, , Step 2: Regroup ones, , 9, , T, , Regrouping ones we get 1 ten + 4 ones. So� write, 4 in ones place and carry over 1 ten in tens place., , 1, 1, , +, 1 Ten, , O, 5, 9, 4, , 14 Ones, , Step 3: Add tens, , T, , O, , 1, 1, 2 Tens, , 4 Ones, , The total number of seeds collected by, Team A in chance 1 is 24., , +, , 5, 9, , 2, , 4, , 27, , 2nd std Maths II-term Unit_2_Addition.indd 27, , 24-06-2019 12:51:17

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www.tntextbooks.in, , Learn, , Add using abacus, , What is the total number of seeds collected by team B in chance 1?, Team B consists of two players Ezhisai and Agilan. They collected 14 and, 16 seeds in chance 1. Hence we need to add 14 and 16 using Abacus followed, by addition procedure. Put 14 beads in the abacus first and then add 16, beads to it., , T, , O, , 1, , 4, , 1, , 6, , T, , O, , 1, , 4, , +, , 1, , 6, , Step 2: Regroup the ones, Regrouping ones we get 1 ten and no ones. So, write, 0 in ones place and carry over 1 ten in tens place., , T, , O, , T, , O, , 1, , 4, , +, , Step 1: Add ones, If we add ones, we get 10 ones., , T, , O, , 1, , 10, , +, T, , O, , 1, , 0, , 1, 1, , 4, , 1, , 6, 0, , 10, , =, , T, , O, , 1, , Step 3: Add Tens, T, , O, , 3, , 0, , +, , 1, , 4, , 1, , 6, , 3, , 0, , Altogether, team B collected 30 seeds in chance 1., 28, , 2nd std Maths II-term Unit_2_Addition.indd 28, , 24-06-2019 12:51:17

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www.tntextbooks.in, , Practice, i) Find the team that wins in chance 2., Team B, , Team A, T, , O, , T, , +, , O, , +, , The team that wins in chance 2 is________., ii) Find the team that wins in chance 3?, Team B, , Team A, T, , O, , T, , +, , O, , +, , The team that wins in chance 3 is________., iii) Find the total number of seeds collected by Agaran and Agilan., , +, , T, , O, , T, , O, , 1, , 5, , 1, , 6, , 3, , 3, , 3, , 8, , 2, , 9, , 3, , 7, , +, , The total number of seeds collected by Agaran is________., The total number of seeds collected by Agilan is________., 29, , 2nd std Maths II-term Unit_2_Addition.indd 29, , 24-06-2019 12:51:17

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www.tntextbooks.in, , Try This, i) Frame the appropriate question for the number fact given in the, table (page number 26) of the ‘Blow, Pick and Add‛ game., Agaran collected 33 seeds., , 1. 33+37=70, , Kuralini collected 37 seeds., Find the total number of seeds, collected by both of them., 2. 26+37=63, , ii) Add the numbers., T, , O, , T, , O, , T, , O, , T, , O, , 5, , 4, , 6, , 2, , 3, , 7, , 4, , 9, , 7, , 5, , 2, , +, , 7, , +, , 8, , +, , +, , +, , 5, , T, , O, , T, , O, , T, , O, , T, , O, , 4, , 7, , 7, , 8, , 3, , 7, , 8, , 6, , 2, , 4, , 1, , 5, , 5, , 8, , +, , +, , 5, , +, , 1, , 0, , 30, , 2nd std Maths II-term Unit_2_Addition.indd 30, , 24-06-2019 12:51:18

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www.tntextbooks.in, , Pleasure Time, Fill in the empty boxes given below., 4, 0, , +, , =, , 3, , 5, , +, , 2, , +, 92, , =, 44, , =, , 28, , 6, +, , 6, , =, , 4, , +, , 10, , 5, 2, , 2, , 14, 8, , 6, 0, , Mental maths, 1. A vegetable seller packs 72 cauliflowers on the first day and 18, cauliflowers on the second day. Find the total number of cauliflowers, packed in two days?, 2. Sujitha counts 24 mango trees on one side of the field and Babitha, counts 36 mango trees on the other side of the field. What is the, total number of mango trees counted?, 3. An ice cream parlour sells 28 ice creams on monday and 53 ice, creams on tuesday. How many ice creams does it sell in two days?, 4. The teacher checks 12 note books on a day. She checks 18 more, note books on the next day. What is the total number of note, books checked by the teacher on the two days?, 5. A gardener plucks 28 lemons in the morning and 15 lemons in the, afternoon. Find the total number of lemons he plucked., , 31, , 2nd std Maths II-term Unit_2_Addition.indd 31, , 24-06-2019 12:51:18

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www.tntextbooks.in, , Number puzzle, , Think Like A Mathematician, , Put the numbers 11, 12, 13, 14, 15, 16, and 17 in the circles so that addition of, three numbers in a straight line gives the, same total., Pleasure Time, i) Find the missing digits of the additon facts given below., T, , O, , T, , 2, , 7, , 4, , +, , 6, , Total, , 8, , 9, , +, , 3, , Total, , 7, , O, , T, , 8, , +, , 6, , Total, , 8, , O, , T, , O, , 5, , 3, , 9, , 6, , 4, , +, 0, , Total, , ii) Raghul gives the sales record sheet to his father to keep a track, of the dress materials sold on the first three days of the week., Day, , Morning, 15 sarees, 25 sarees, 30 sarees, , Monday, Tuesday, Wednesday, , Afternoon, 10 sarees, 12 sarees, 13 sarees, , Evening, 20 sarees, 14 sarees, 35 sarees, , Look at the sales record sheet and find the total number of sarees, he sold on the following days by completing the information., Monday, , +, , T, , O, , 1, , 5, , 1, , 0, , 2, , 0, , Tuesday, T, , +, , Wednesday, , O, , T, , O, , +, , 32, , 2nd std Maths II-term Unit_2_Addition.indd 32, , 24-06-2019 12:51:18

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www.tntextbooks.in, , 2.5 Subtraction upto 99 with regrouping, , Recall, , i) Subtract the following two-digit numbers., , −, , T, , O, , T, , O, , T, , O, , T, , O, , 5, , 6, , 9, , 0, , 6, , 7, , 2, , 5, , 1, , 2, , 4, , 0, , 1, , 0, , 1, , 5, , −, , −, , −, , ii) Two squirrels collected nuts in the hollow of tree trunk., Listen to their conversation., 1, We have a, collection, of 58 nuts., , 2, But we have already, eaten 12 nuts on the, first day., , 3, On the third day,, we have eaten 16, more nuts., I wonder how many, nuts are left?, , On the second day, we, have eaten 10 more nuts., , Can you help the squirrels to find, the number of nuts that are left?, Total number of nuts =, To, find, the, remaining number, of nuts at the end, of the first day� we −, need to subtract, 12 from 58., , Continue subtracting successively, for finding the number of nuts that, are, left, at, the, end, of, second, and, third, day, complete the subtraction procedure., , −, , T, , O, , 1, , 0, , −, , 58, T, 5, 1, , O, 8, 2, , T, , O, , 1, , 6, , 33, , 2nd std Maths II-term Unit_2_Subtraction.indd 33, , 25-06-2019 18:13:31

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www.tntextbooks.in, , Travel Through, Each of the four friends Kavin, Kavini,Thirumagan, and Sudar collected tamarind seeds and made, geometrical shapes using the seeds., , s, Keyword, t, Subtrac, ce, Differen, Balance, , The number of seeds used by them are tabulated as follows:, Name, Kavin, Kavini, Thirumagan, Sudar, , Shapes, , Seeds taken, 22, 30, 24, 54, , Seeds used, 9, 18, 16, 38, , Kavin takes 22 seeds and used 9 seeds for making a triangle., How many seeds are left with him?, Sudar takes 54 seeds and used 38 seeds to make a rectangle. Find, the number of seeds left with her?, Teacher‛s Note:, Teacher can motivate children to frame different subtraction questions and subtract them, using the information given in the above table., , 34, , 2nd std Maths II-term Unit_2_Subtraction.indd 34, , 25-06-2019 18:13:32

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www.tntextbooks.in, , Learn, , Subtract using seeds, , Kavin make a triangular shape using the seeds collected by him., Observe the table, write the subtraction fact to find the number, of seeds left with him., To find the number of seeds left with Kavin, we need to subtract, the number of seeds used from the number of seeds taken by him., Let us subtract 9 from 22 using the seeds followed by the, subtraction procedure. Take 22 seeds into groups of tens and ones., Step 1: Subtract the ones Represent 22 as 2 tens, and 2 ones and cancel 9 seeds from ones., 2tens, , 2ones, , T, , O, , 2, , 2, , Step 2: Regroup by converting tens to ones, We need to take away 9 seeds so we subtract, the ones. We cannot subract 9 ones from 2 ones., So, we should regroup the seeds to overcome the, shortage of seeds. For that 1 ten is changed, into 10 ones., 1ten, , 12ones, , T, , O, , 1, , 12, , 2, , 2, , -, , Step 3: Subtract the ones Subtract 9 ones, from 12 ones., 1ten, , 9, , 12ones, , 9, , T, , O, , 1, , 12, , 2, , 2, , -, , 9, 3, , Step 4 : Subtract the tens. Now subtract, tens. There is no tens to subtract., So 1 ten is to be written., 1ten, 3ones, , T, , O, , 1, , 12, , 2, , 2, , Hence, the number of seeds left with Kavin is 13., , 9, 1, , 3, , 35, , 2nd std Maths II-term Unit_2_Subtraction.indd 35, , 25-06-2019 18:13:33

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www.tntextbooks.in, , Subtraction using abacus, , Learn, , Sudar collected 54 seeds and used 38 seeds to form a rectangle., How many seeds are left with her?, To find the number of seeds left with Sudar we shall subract 38, from 54. We can do the subtraction 54-38 using abacus followed, by the subtraction procedure. 54 has 5tens and 4ones., T, O, So, put 5green beads in tens place and, 4 red beads in ones place. To take away, 38 from 54 we need to take away 3tens, 5, 4, and 8 ones from 5 tens and 4 ones., Step 1: Subtract ones, , T, , O, , 5, , 4, , -, , 3, , 8, , T, , O, , 4, , 14, , -, , 5, , 4, , 3, , 8, , -, , T, 4, 5, 3, , O, 14, 4, 8, , We cannot subtract 8 ones from 4 ones., So exchange 1 ten as 10 ones., So we have, , =, T, , O, , Step 2: Cancel 8 ones from 14 ones, Now we can subtract 8 ones from 14 ones., , T, , O, , 6, , Step 3: Subtract tens, Subtract 3 tens from 4 tens., , T, , O, , 1, , 6, , -, , So, the number of beads left with Sudar is 16., , T, , O, , 4, , 14, , 5, , 4, , 3, , 8, , 1, , 6, , 36, , 2nd std Maths II-term Unit_2_Subtraction.indd 36, , 25-06-2019 18:13:33

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www.tntextbooks.in, , Practice, 1. How many more seeds were used for making rectangle than, triangle ?, T, , O, , 3, , 8, , 2. Thirumagan collected 24 seeds and used, 16 seeds. How many seeds are left with him?, , 9, , T, , O, , T, , O, , 3. Kavini used 18 out of 30 seeds collected by her., What is the difference?, , -, , 4. What is the difference in the number of seeds used by kavin, and kavini?, T, O, , 37, , 2nd std Maths II-term Unit_2_Subtraction.indd 37, , 25-06-2019 18:13:33

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www.tntextbooks.in, , Practice, Subtract the following two-digit numbers., , -, , -, , T, , O, , T, , O, , T, , O, , T, , O, , 2, , 2, , 3, , 7, , 4, , 0, , 9, , 2, , 1, , 8, , 2, , 9, , 3, , 5, , 8, , 0, , T, , O, , T, , O, , T, , O, , T, , O, , 7, , 0, , 8, , 4, , 6, , 3, , 8, , 0, , 2, , 7, , 7, , 8, , 5, , 6, , 5, , 2, , -, , -, , -, , -, , -, , -, , 32 – 28 =, , 94 – 59 =, , 72 – 46 =, , 46 – 17 =, , 50 – 36 =, , 85 – 67 =, , Think Like a Mathematician, Write the missing numbers in the boxes below., 29, , +, , =, , 29, , -, , =, , 29, , Try This, Find the missing digits in each of the subtraction facts., T, , O, , T, , O, , 3, , 8, , 9, , 8, , -, , 1, , Difference, , 2, , 2, , Difference, , 1, , T, , O, , T, , O, 3, , 0, , -, , 2, , 7, , -, , 1, , 8, , Difference, , 3, , 4, , Difference, , 2, , 4, , 38, , 2nd std Maths II-term Unit_2_Subtraction.indd 38, , 25-06-2019 18:13:34

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www.tntextbooks.in, , Know more, i) We can check the subtraction process in two ways., Consider the subtraction fact 53-36=17., i) By adding: 36+17=53, , ii) By subtracting: 53-17=36, , Given two numbers 53 and 36. When 36 is subracted from 53,, we get 17. To verify the answer we can either add the number, 36 and 17 to get the given number 53 or subract 17 from 53 to, get the other number 36., ii) When we subtract 0 from any number we get the same number., 37 - 0, , 37, , 48 - 0, , 95 - 0, , It means we did not take away anything from the number., iii) When a number is subtracted from itself it gives 0., 25-25, , 0, , 59-59, , 86-86, , It means we have taken away completely from the given number., Mental maths, 1. Kamal fixed 56 tubelights in a party hall. If 18 tubelights, were fused, then how many tubelights were used?, 2. A factory produced 95 cars in a day. How many cars, were unsold if 37 were sold?, 3. Kumar walked 23 steps out of 90 steps to reach a, shop. How many more steps he has to walk to reach the shop?, 4. Kamali had 31 rupees with her. She bought a pen for 15 rupees., She saved the remaining amount. Find the amount saved by her., 5. In a class of 42 students, 26 are girls. How many are boys?, 39, , 2nd std Maths II-term Unit_2_Subtraction.indd 39, , 25-06-2019 18:13:34

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www.tntextbooks.in, , UNIT, , 3, , Patterns, 3.1 Block patterns, , Travel Through, , Hide and Seek, , During a rainy season, Inba, the rabbit and his friends, (dog, cat, cow, hen, duck, horse) are playing hide and, seek. Help him to find his friends who are hiding in the, farm., , Keyword, , s, , Patterns, Shapes, ions, Impress, , 40, , 2nd std Maths II-term Unit_3.indd 40, , 25-06-2019 18:12:58

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www.tntextbooks.in, , Learn, We can make creative patterns in shapes using thumb as, shown below., , We can create patterns in shapes using potato as given below., , These patterns in shapes are formed by impression of leaf., , 41, , 2nd std Maths II-term Unit_3.indd 41, , 25-06-2019 18:12:59

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www.tntextbooks.in, , Practice, Identify and complete the pattern using thumb., , Complete the flower using lady‛s finger patterns. One is shown, for you., , Complete the caterpillar using leaf pattern., , 42, , 2nd std Maths II-term Unit_3.indd 42, , 25-06-2019 18:13:00

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www.tntextbooks.in, , 3.2 Patterns in shapes, Recall, Observe and continue the patterns., s, Keyword, Shapes, Patterns, , Travel Through, , Pongal, , What are the shapes you see in this picture?, Are the shapes repeated? If yes, in what manner?, Teacher‛s Note:, Teacher can encourage children to observe the shapes and discuss the patterns., , 43, , 2nd std Maths II-term Unit_3.indd 43, , 25-06-2019 18:13:01

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www.tntextbooks.in, , Learn, Let us learn the patterns in shapes by observing them., , Activity,  Take two sets of shapes each namely square and triangle made of, colour paper.,  Divide the class into two groups.,  Provide one set of shapes to each group.,  Now the teacher tells the number of shapes to be used to create, patterns. (for example, 1 square, 1 triangle),  Then each of the groups create different patterns on the floor, using 1 square and 1 triangle.,  Encourage the groups to create more number of patterns.,  Continue the activity with different number of shapes.,  Various patterns created using the triangle and square shapes are, shown below., , 44, , 2nd std Maths II-term Unit_3.indd 44, , 25-06-2019 18:13:01

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www.tntextbooks.in, , Try This, Observe and complete the following patterns., , Activity, 1, , 5, , King‛s crown, 2, , 3, , 4, , 6, , Make a King‛s crown by folding colour papers, into triangles as shown in the above picture., 45, , 2nd std Maths II-term Unit_3.indd 45, , 25-06-2019 18:13:01