The fraction 21/23 cannot be simplified. You could muliply both of them by the same number, and get a fraction like 42/46, but it's better to keep fractions simplified.
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equivalent fraction for 21 over 23 = 42/46
two fractions are equivalent 21 over 23 = 42/46, 63/69
46/12
It is equal to as a fraction 23 over 100?
51/21 = 17/7 = 23/7