1 and 20
2 and 10
4 and 5
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20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)
1 and 20 2 and 10 4 and 5
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)
12 and 18 have three factor pairs.
1 and 500, 2 and 250, 4 and 125, 5 and 100, 10 and 50, 20 and 25, a total of 6 factor pairs.