3/21 = 1/7.
Divide 3 to the denominator and numerator, yielding 1/7.
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The simplest form is 1/21
Divide the 3 by 3 and the 21 by 3 and you get 1/7 (one over seven) which is the simplest form.
divide top and bottom by 3....7/12
21/49 = 3/7
its is 3/8