draw a t chart the answer is for 20:1,2,4,5,10,20 for 30:1,2,3,5,6,10,15,30
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To find the common factors of 30 and 20, we first list the factors of each number. The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The factors of 20 are 1, 2, 4, 5, 10, and 20. The factors that are common to both numbers are 1, 2, 5, and 10.
Factors for 30 are: 1, 2, 3, 5, 6, 10, 15, 30 Out of these which are also factors of 20 are: 1, 2, 5, 10
20 and 28 both have six factors.
If you include 30, both 24 and and 30 have 8 factors, the most in that range.
1, 2, 5 and 10.