It is: (100+51)/2 = 75.5
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.51
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.
5.01 = 51/100
0.51/1 = 51/100
To find the percentage of a number, you simply divide the number by 100. In this case, to find the percentage of 51 out of 204, you would divide 51 by 204. This gives you 0.25. To convert this to a percentage, you multiply by 100, giving you 25%. Therefore, 51 is 25% of 204.