The factor pairs of 10 are 1*10, 2*5
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Factor pairs are just the factors of a number listed in a different way. The factors of 20 are 1, 2, 4, 5, 10, 20 The factor pairs of 20 are (20,1)(10,2)(5,4)
The factor pairs of 150 are 1*150, 2*75, 3*50, 5*30, 6*25, and 10*15
The factor pairs of 250 are: 1 x 250 2 x 125 5 x 50 10 x 25
1 The factor pairs of 100 are 1 and 100, 2 and 50, 4 and 25, 5 and 20, and 10 and 10. The factor pairs of 49 are 1 and 49, and 7 and 7. Since the only factor they share is 1, 1 is their greatest common factor.
1 and 500, 2 and 250, 4 and 125, 5 and 100, 10 and 50, 20 and 25, a total of 6 factor pairs.