21/10 is already in simplest form as a fraction. As a mixed number it is 21/10
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21/10 is in its simplest form.
10/21 is the simplest form.
7/10
21/5 is the simplest form.
21 over 70 simplifies to 3 over 10 in simplest form. To simplify, divide both the numerator and denominator by their greatest common factor which is 7.