8/21 is already in simplest form.
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21/34
525 over 100. In simplest form it would be 21 over 4.
21/4
5x over 7 The 15 over 21 reduces to 5 over 7 because both can be divided by 3 The two y's cancel out leaving the x on top.
There are an infinite number of fractions that are all equal to 21/49 .The one in lowest terms (simplest form) is 3/7.