The common factors of 20 and 45 are 1 and 5
Factors of 45: 1 and 45, 3 and 15, and 5 and 9
Factors of 20: 1 and 20, 2 and 10, and 4 and 5
So the common factors are 1 and 5.
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The greatest common factors of 10 40 and 45 is 5
The factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, and 100. The factors of 45 are 1, 3, 5, 9, 15, and 45. Factors are numbers that can be multiplied together to give the original number.
45:1,3,5,9,15, and 45 60:1,2,3,4,5,6,10,12,15,20,30 and 60
1,3,5,9,15,45 1,2,3,5,6,9,10,15,18,30,45,90
The factors of 45 are 1,3,5,9,15 and 45.