This isn't a great example, because the powers (exponents) of these two numbers are equal.
22 x 5 = 20
22 x 7 = 28
The GCF is 22 which is 4.
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22 x 5 = 20
Common factors of 20 are; 1,2,4,5, and 20. 1x20=20, 2x10=20, 4x5=20, 5x4=20, 20x1+=20. If you have to show your work then just check mine.The factors of 20 are 1,2,4,5,10 and 20. For them to be common, they have to be compared to another set of factors.
20 has six factors.
Factors of 20:1,2,4,5,10,20Factors of 65:1,5,13,65The common factors are 1 and 5.
The factors of 15 are 1,3,5,15 The factors of 20 are 1,2,4,5,10,20