20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)
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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)
12 and 18 have three factor pairs.
How they're listed. The factors of 20 are 1, 2, 4, 5, 10, 20 The factor pairs of 20 are (20,1)(10,2)(5,4)
The number 18.
1 and 20 2 and 10 4 and 5