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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Yes. By multiplying 3/3 times 7/12, you get 21/36.
21/36, or 7/12
divide top and bottom by 3....7/12
36/10 = 36 ÷ 10 = 3.6
5.58333