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Anonymous
Since the numbers 20 and 21 share no common positive integer factors, 20/21 is expressed in its simplest form.
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20/21 is in its simplest form.
21/20
42/20 = 21/10 = 21/10
10/21 is in its simplest form.
1.05 = 105/100 = 21/20
-21/20