3 pairs
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3 pairs of factors. They are: 1 and 20 2 and 10 4 and 5 Pairs of factors are numbers that you multiply together to make that number, e.g. 4x5=20. Trust me I'm a teacher!
The factor pairs of 200 are (200,1)(100,2)(50,4)(40,5)(25,8)(20,10) None of them have a sum or difference of 20. Factors of 200 that add to 20 are 10 and 10.
10
100, 50, 25, 20, 10, 5,4,2,1 are the factors and there are 9 of them.
1 and 5 are the factors of 20 which are odd.