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The common factors of 20, 25, and 40 are 1 and 5.
The factors of 15 are: 1, 3, 5, 15 The factors of 20 are: 1, 2, 4, 5, 10, 20 The factors of 25 are: 1, 5, 25
The bottom number of a fraction is called the denominator. In order to add and subtract fractions with different denominators, it is necessary to make them the same, or "common." Example: 1/4 + 1/5. The common denominator is 20. 1/4 = 5/20 1/5 = 4/20 1/4 + 1/5 = 5/20 + 4/20 = 9/20
the factors of 5 are 1 and 5the factors of 20 are 1 2 4 5 10 20the factors of 45 are 1 3 5 9 15 45so the common factors are 1 and 5
1, 20, 2, 10 , 4, 5