51/21 = 17/7 = 23/7
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21/4 = 51/4
2.04 as a fraction in lowest terms is 51/25. The mixed number form is 21/25
The mixed number for 21/4 is 5 1/4.
31 51/100 I assume a mixed fraction? To do this, take 31 and move it to the left. The decimal .51 means 51 over 100 (51/100). Usually you reduce the 51/100 fraction, but in this case, you cannot, so therefore 31 51/100 is the mixed fraction. To check this, convert it into an improper fraction: 100*31 + 51 = 3151/100. If you divide 3151 by 100, you get 31.51, meaning that it is correct.
51/3