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In general, why is a common denominator necessary to add and subtract fractions?

User NathanD
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5 votes

Answer:

Explanation:

makes it easier.

User Slight
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Answer:

The denominator of a fraction tells you the relative size of the pieces. ... Therefore, the reason fractions need a common denominator before adding or subtracting is so that the numbers of pieces you are adding/subtracting are all the same size.

Explanation:

User Ultifinitus
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