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Q: What does find the common denominator for the fraction pairs mean?

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Find a common denominator.

Find the least common denominator.

By finding the lowest common multiple of the denominators

That's one fraction. You need at least two to find something in common between them.

multiply the nominator and denominator of each fraction by the denominator of the other fraction

84/100 is one fraction. To find a common denominator, you need at least one more.

You find the highest common factor of the numerator and denominator. If that is 1, then the fraction is in its simplest form.

First, find a common denominator for the two (or more) fractions. Then, for each fraction, multiply numerator and denominator by the same number (different numbers for different fractions, though), to convert to the common denominator.

Because if you have the same denominator then you don't have to find the common denominator.

just find what all numbers have in commin

A fraction is in simplest form when the numerator and denominator have no common factor except ' 1 '.

To get the right answer when you add or subtract them.

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