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Probably because it saves you time. These are the rules from 1 to 50

1: Every number is a multiple of 1

2: The number ends in 0, 2, 4, 6 or 8 (an even digit)

3: The sum of the digits is a multiple of 3

4: The number ends in 00, 04, 08, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92 or 96

5: The number ends in 0 or 5

6: The number is a multiple of both 2 and 3

7: The difference between twice the last digit and the rest of the number is a multiple of 7

8: The 100s digit is even and the last 2 digits are 00, 08, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88 or 96, or the 100s digit is odd and the last 2 digits are 04, 12, 20, 28, 36, 44, 52, 60, 68, 76, 84 or 92

9: The sum of the digits is a multiple of 9

10: The number ends in 0

11: The difference between the last digit and the rest of the number is a multiple of 11

12: The number is a multiple of both 3 and 4

13: The sum of 4 times the last digit and the rest of the number is a multiple of 13

14: The number is a multiple of both 2 and 7

15: The number is a multiple of both 3 and 5

16: The 1000s digit is even and the last 3 digits are a multiple of 16 or the 1000s digit is odd and the last 3 digits are 8 times an odd number

17: The difference between 5 times the last digit and the rest of the number is a multiple of 17

18: The number is a multiple of both 2 and 9

19: The sum of twice the last digit and the rest of the number is a multiple of 19

20: The number ends in 00, 20, 40, 60 or 80

21: The difference between twice the last digit and the rest of the number is a multiple of 21

22: The number is a multiple of both 2 and 11

23: The sum of 7 times the last digit and the rest of the number is a multiple of 23

24: The number is a multiple of both 3 and 8

25: The number ends in 00, 25, 50 or 75

26: The number is a multiple of both 2 and 13

27: The difference between 8 times the last digit and the rest of the number is a multiple of 27

28: The number is a multiple of both 4 and 7

29: The sum of 3 times the last digit and the rest of the number is a multiple of 29

30: The number is a multiple of both 3 and 10

31: The difference between 3 times the last digit and the rest of the number is a multiple of 31

32: The 10000s digit is even and the last 4 digits are a multiple of 32 or the 10000s digit is odd and the last 4 digits are 16 times an odd number

33: The sum of 10 times the last digit and the rest of the number is a multiple of 33

34: The number is a multiple of both 2 and 17

35: The number is a multiple of both 5 and 7

36: The number is a multiple of both 4 and 9

37: The difference between 11 times the last digit and the rest of the number is a multiple of 37

38: The number is a multiple of both 2 and 19

39: The sum of 4 times the last digit and the rest of the number is a multiple of 39

40: The number ends in 000, 040, 080, 120, 160, 200, 240, 280, 320, 360, 400, 440, 480, 520, 560, 600, 640, 680, 720, 760, 800, 840, 880, 920 or 960

41: The difference between 4 times the last digit and the rest of the number is a multiple of 41

42: The number is a multiple of both 2 and 21

43: The sum of 13 times the last digit and the rest of the number is a multiple of 43

44: The number is a multiple of both 4 and 11

45: The number is a multiple of both 5 and 9

46: The number is a multiple of both 2 and 23

47: The difference between 14 times the last digit and the rest of the number is a multiple of 47

48: The number is a multiple of both 3 and 16

49: The sum of 5 times the last digit and the rest of the number is a multiple of 49

50: The number ends in 00 or 50

What else can I help you with?

Related Questions

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