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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

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