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Answer:

When fractions have the same denominator, we say they have common denominators. Having common denominators makes things like comparing, adding, and subtracting fractions easier.

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Answer:

Because n order to add fractions, the fractions must have a common denominator. We need the pieces of each fraction to be the same size to combine them together these two fractions have the same denominator, so the equal parts that the whole has been split into are the same size.

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