21 and 45 are both divisible by 3. 21/3 = 7 and 45/3 = 15. So the number can be simplified to 7/15
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When you make the fraction: 21 over 1 it is equal to the whole # 21
11 / 21 = 0.523809524
2.5 is equal to 21/2
It is: 1/7
21/33