Tests of Divisibility of 2 to 20

1. Tests of Divisibility of2 to 20

2. Divisibility of 2 • When we want to test a number divisible by 2 we should look at the last number if it ends with 0,2,4,6 and 8. It will be divisible by 2.

3. Questions Answer the following • 218 • 564 • 8897 • 641 • 9086 • 543 • 235 • 879 • 43 • 54

4. Divisibility of 3 • When we want to test a number divisible by 3 we should add the digits of that number if the sum of the digits of that number is divisible by 3 so it is divisible by 3.

5. Questions Answer the following • 234 • 875 • 9087 • 4312 • 8956 • 8765 • 9087 • 5423 • 6757 • 6924

6. Divisibility of 4 • When we want to test a number divisible by 4 we should look at the two last digits if it divides at 4 and the reminder is 0 . It will be divisible by 4.

7. Questions Answer the following • 786 • 908 • 764 • 907 • 213 • 87642 • 23189 • 9876 • 3421 • 32

8. Divisibility of 5 • When we want to test a number divisible by 5 we should look at the last number if it is 0 or 5. It will be divisible by 5.

9. Questions • Answer the following • 76 • 897 • 908 • 54 • 67 • 90 • 320 • 890 • 789 • 912875

10. Divisibility of 6 • When we want to test a number divisible by 6. The number should be even this means divisible by 2 and the sum of the number is divisible by 3. The number is divisible by 6.

11. Questions • Answer the following • 243 • 786 • 908 • 890 • 986 • 786 • 6753 • 8769 • 907 • 9876

13. Divisibility of 7 • When we want to test a number divisible by 7 . We take the last digit number and double it and then subtracts the number with double of the last digit. Repeat the same steps again if still you can not get . If it is divisible by 7 and the reminder is 0 it will be divisible by 7.

14. Questions • Answer the following. • 343 • 897 • 908 • 658 • 431 • 918 • 865 • 9875 • 845 • 9086

15. Divisibility of 8 • When we want to test a number divisible by 8 we should look at the three last digits if it divides at 8 and the reminder is 0 . It will be divisible by 8.

16. Questions Answer the following. • 45436 • 9806 • 908524 • 908598 • 9747 • 978 • 9875 • 21350 • 54328 • 89765

18. Divisibility of 9 • When we want to test a number divisible by 9 we should add the digits of that number if the sum of the digits of that number is divisible by 9 so it is divisible by 9.

19. Questions • Answer the following • 234 • 99775 • 971233 • 6421 • 78 • 90863 • 89923 • 89987 • 7532 • 6321

20. Divisibility of 10 • When we want to test a number divisible by 10 we should look at the last number if it is 0. It will be divisible by 10.

21. Questions • Answer the following • 12460 • 7642 • 3522 • 89860 • 99755 • 9643 • 9966 • 80650 • 6890 • 90760

22. Divisibility of 11 • When we want to test a number divisible by 11 we should add digit and subtract digit and repeat the step with all the digit of the number. It will be divisible by 11. • Subtract the last digit with the number made by the another digits . If it is a number divisible by 11 so the original number is divisible by 11.

23. Questions • Answer the following • 3456 • 9086 • 4522 • 675 • 899865 • 78965 • 89768 • 8965 • 8865 • 98765

24. Divisibility of 12 • When we want to test a number divisible by 12 . The number should be divisible by 3 and 4. The divisible number is 12.

25. Questions • Answer the following. • 4557 • 8976 • 89665 • 897531 • 12345 • 90876 • 45678 • 908788 • 89766 • 98788

26. Divisibility of 13 • When we want to test a number divisible by 13. Multiply by 4 the last digit and then add it to the remaining number. The sum should be divisible by 13

27. Questions • Answer the following: • 223 • 45 • 78 • 79 • 98 • 91 • 56 • 797 • 764 • 23455

28. Divisibility of 14 • When we want to test a number divisible by 14. If the number is divisible by 2 and 7. It will be divisible by 14.

29. Divisibility of 14 • Answer the following: • 43 • 78 • 95 • 14 • 98 • 782 • 897 • 653 • 677 • 4322

30. Divisibility of 15 • When we want to test a number divisible by 15. It should be divisible by 3 and 5. It will be divisible by 15.

31. Questions Answer the following • 234 • 678 • 908 • 76554 • 44560 • 95 • 75 • 325 • 56 • 125

32. Divisibility of 16 • When we want to test a number divisible by 16 we should look at the four last digits if it divides at 16 and the reminder is 0 . It will be divisible by 16.

33. Questions • Answer the following: • 23455 • 67889 • 234567 • 3248 • 76532 • 887654 • 235789 • 567899 • 877654 • 9007642

34. Divisibility by 17 • When we want to test a number divisible by 17. Multiply by 5 the last digit and then subtract it to the remaining number. The sum should be divisible by 17.

35. Questions • Answer the following: • 3555 • 89876 • 90577 • 75677 • 886677 • 765333 • 2346898 • 9865 • 985 • 2345

36. Divisibility of 18 • When you want to test a number divisible by 18 . It should be divisible by 2 and 9 . It will be divisible by 18.

37. Questions • 345 • 324 • 678 • 897 • 788 • 988 • 76543 • 5432 • 76889 • 9872

38. Divisibility of 19 If you want to test the divisibility of 19. Multiply the last 2 numbers and add it to the remaining number. It will be divisible by 19.

39. Questions • 455 • 678 • 864 • 874 • 986764 • 267964 • 6532 • 87542 • 98532 • 432

40. Divisibility by 20 • If you want to test a number divisible by 20,the number formed by last two digits in a number will be divisible by 20.

41. Questions • 456707 • 9876320 • 3420 • 4390 • 9087 • 99876 • 543180 • 8765429 • 702040 • 704