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Simplest form of 7/9 x 21/10

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Simplest form of 7/9 x 21/10-example-1
User Ekoam
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7/9 times 21/10 can become 7/3 times 7/10 which is 49/30 which is 1 19/30 at it's most reduced form since 19 is prime.
User Alextoind
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