15:1,3,5,15
45:1,3,5,9,15,45
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The factors of 45 are 1, 3, 5, 9, 15, 45. For them to be common, they need to be compared to another set of factors.
The highest common factor 15
The factors of 10 are: 1, 2, 5, 10The factors of 45 are: 1, 3, 5, 9, 15, 45The common factors are: 1, 5
The common factors of 180 and 225 are 1, 3, 5, 9, 15 and 45.
First you find the factors of 45 and 60. The Factors of 45 are:1,3,5,9,15,and 45 The Factors of 60 are:1,2,3,4,5,6,10,12,15,20,30,60 The GCF is the highest common number so the GCF is 15.