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That is it. The fraction does not reduce at all, since 140 and 297 have no common factors. ■
The factors of 140 are 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, and 140
Factors are numbers you can multiply together to get another number. Therefore, all the factors of 21 are as follows: 1,3,7,21.
If you include 1, you'll have an infinite number of answers. If you don't, you have 2 x 5 x 5
All factors of 140 are: -140, -70, -35, -28, -20, -14, -10, -7, -5, -4, -2, -1, 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, and 140.