20 and 40 have 4 and 5 as common factors.
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4 and 5
They can be: 20 and 50 or 4 and 25
To simplify fractions, look for common factors - factors that are shared by both numbers, in this case, 4 and 8. If you find one, divide both numbers by the common factor. Repeat, until there are no more common factors.
The numbers 24 and 32 have 4 common factors, and they are 1, 2, 4 and 8, with 8 being the largest.
1 and 20 is one possible pair.