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4 over 5 is in simplest form because 5 is a Prime number. There is no number that you can divide both 4 and 5 by evenly to continue reducing.

If the fraction was 5 over 20, you could divide both top and bottom by 5 and get 1 over 4. 5/20 = 1/4.

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14y ago
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Q: Explain how you know 4 over 5 is simplest form?
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