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1 फेब्रुवाटी, Mathematics, इयत्ता - 3 टी, Multiplication,, टेस्ट सोडवा, Solve in your notebook, Multiplication of tens, XSI614, Tony : Multiplying a number by ten means taking ten times that number., Thus, 3 x 10 is ten times 3 or three tens, or 3 x 10 = 30., Also, 4 x 10 = 40, 5 x 10 = 50, 6 x 10 = 60, 10 x 10 = 100., Sonu : Then 13 × 10 will be 130, 24 x 10 = 240 and 40 × 10 = 400., : Yes. To multiply a number by ten, we just need to put a zero after it., Salma : 20 x 3 means 20 + 20 + 20. And that is 60., Tony : 20 x 3 means three times 2 tens = 6 tens = 60., Tai : To find 20 × 3, we can multiply 2 and 3 and place a zero after it. So the, Tai, product is 60. In this way,, 20 x 6 = 2T x 6 = 12T = 120, 40 x 5 = 4T x 5 = 20T = 200, Sonu : If there's a zero in the units place of þoth numbers, what do we do ?, : When multiplying 30 x 20, write one of the numbers in the tens form., 50 x 7 = 35 T = 350, 80 x 3 = 24 T= 240, Tai, 30 x 20 means 30 × 2T, Salma : But this gives us 60T. That means 600., Sonu : So 30 x 20 is 600, right ?, Tony : 3T x 2T is 6H !, Tai : Right ! It means that in 30 x 20, first carry out 3 × 2 and then write two, zeros after their product., Try it. 40 x 20 = 800., 30 x 30 = 900., If there is a zero in the units place of both numbers, then,, multiply the digits in their tens places and, write two zeros after the product., • Multiply., * 4 x 50 =, * 3Tx 3 T=, * 70 x 10 =, * 6 x 20 =, * 4 Tx 2 T =, * 20 x 20 =, www.vipulguruji.com, वेब सोर्स - बालभारती