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5=5, 10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100

4=4,8,12,16,20,24,28,32,36,40,44,48,52,56,62,66,70,74,78,82,86,90,94,98,102

The common factors are 20, 40, 70, 90.

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The above statement is incorrect. The above addresses common multiples, not factors.

To find the common factors, first factor the numbers at issue:

5 = 5 * 1

4 = 2 * 2 * 1.

The only common factor is 1.

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9y ago
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14y ago

1 is the only common factor for 4 and 5.

5 is a Prime number and does not have any factors apart from 1 and itself.

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Q: What are the common factors of 4 and 5?
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