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Because 3 divides evenly into 21 and 36 with no remainder.
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How do you write 21 over 36?
To simplify the fraction 21/36 you would divide the numerator and denominator by the GCF (greatest common factor) of 21 and 36 which is 3. So this simplifies to: 21/36 = (3 * 7)/(3 * 12) = 7/12.
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