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(Textbook pages 47 and 48), , Tests for divisibility, , , , , , , , , , Tests for divisibility by 2, 5, 10: divisible by 2., (1) Test for divisibility by 2 : Numbers havin, pate ce rie BS, (2) Test for divisibility by 5 : Numbers having 0 or 5 in their units place are divisi, , i 10., (3) Test for divisibility by 10 : Numbers having 0 in their units place are divisible by, , g0, 2, 4,6, 8in their units place, , Write the correct numbers in the blanks :, , Out of the numbers 4855, 25983, 3050, 53215, 100, and 89806, , (1) The numbers divisible by 2 are 3050, 10020 3725 Es, , 20, 34695, 365081, 89850, 86904, 27288, , 39806..., , Qyo OWL. ye, oldie t 10p29 36, 349950..., , (2) The numbers divisible by 5 are cay MIG ALE:, , (3) The numbers divisible by 10 ao DYDY 10620, 84850 i 042 27295) BIG Ben, (5D 5 3215, Ie% nono sgaeg), , (4) The numbers divisible both by 2 and 5 are / W866 DIMA 2.1 LLS, , (5) The numbers divisible by 5 but not by 10 are ie 2 ey) 53040 15 39.15, £0020, 2696, 890, (6) The numbers not divisible by aay ‘of the three numbers 2, 5 or 10 are 2365031... ae, , eh * a, , Prime and Composite numbers, , , , , , (Textbook pages 48 and 49), , , , , , , , , , Prime numbers :, , Factors of 2 are 1 and 2, Factors of 3 are 1 and 3, Factors of 5 are 1 and 5, The numbers 2, 3, 5 have only two factors—1 and the number itself. Such numbers are called, ‘ime OS,, , numbers are those numbers which have only two factors 1 and the number i, , ite numbers :, , of 4 are 1, 2 and 4, , 6 are 1, 2,3 and6, 8are 1, 2,4 and 8, -s 4, 6, 8 have more than two factors. Such numbers are called ¢, , rs are those numbers which have more than two facto, , ther a prime number nor a composite number., , VIKAS SMART WORKBOOK-MATHEMATICS : STANDARD V