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Using the definition that proper factors do not include 1 and the number itself, prime numbers do not have proper factors.

1:

2:

3:

4: 2

5:

6: 2, 3

7:

8: 2, 4

9: 3

10: 2, 5

11:

12: 2, 3, 4, 6

13:

14: 2, 7

15: 3, 5

16: 2, 4, 8

17:

18: 2, 3, 6, 9

19:

20: 2, 4, 5, 10

21: 3, 7

22: 2, 11

23:

24: 2, 3, 4, 6, 8, 12

25: 5

26: 2, 13

27: 3, 9

28: 2, 4, 7, 14

29:

30: 2, 3, 5, 6, 10, 15

31:

32: 2, 4, 8, 16

33: 3, 11

34: 2, 17

35: 5, 7

36: 2, 3, 4, 6, 9, 12, 18

37:

38: 2, 19

39: 3, 13

40: 2, 4, 5, 8, 10, 20

41:

42: 2, 3, 6, 7, 14, 21

43:

44: 2, 4, 11, 22

45: 3, 5, 9, 15

46: 2, 23

47:

48: 2, 3, 4, 6, 8, 12, 16, 24

49: 7

50: 2, 5, 10, 25

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Wiki User

12y ago
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The proper factors of 30 are: 1 ,2, 5, 10 and 15. Proper factors are all the numbers that equally go into a number except the number itself! :)

* * * * *

Why are 3 and 6 excluded?

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Wiki User

12y ago
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Do you mean of 30? if so then it is 1*30, 2*15, 3*10 and 5*6

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Wiki User

13y ago
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Out of that list, the only number that has proper factors is 4. The proper factor of 4 is 2.

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Wiki User

7y ago
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i do not know

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Wiki User

15y ago
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1, 2, 3, 5, 6, 10, 15, 30

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Wiki User

14y ago
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One doesn't have any proper factors.

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Wiki User

13y ago
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1, 2, 3, 5, 6, 10, 15, 30

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Wiki User

12y ago
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Q: What are the proper factors of numbers from 1 to 30?
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