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When you add three of something to four of something, you get seven of something. It doesn't matter what the somethings are. Think of ninths as somethings. If you add three ninths and four ninths, you have to wind up with seven ninths. You can't wind up with seven eighteenths, because you weren't adding eighteenths to begin with.

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Wiki User

11y ago

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because it would be all muddled up

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Anonymous

4y ago
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Why

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Anonymous

4y ago
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Q: Why does denominator stay the same when you add fractions?
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