to find the percentage of something you divide it by 10 and times how many needed
e.g 30% of 210
210 divide 10X30
estimation is when you make an appropriate guess
e.g estimate 23 X 48 you would round up or down, so estimate answer = 20X50
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18.18%
Estimation is 40, which is 1/3 of 120. Actual answer is 39.27
0.5 % of 87 = 0.05 * 87 = 4.35 (simply, (5*87)/100)
If an estimation, or estimate, is a guess, an approximate estimation is a rougher guess.
Estimation is a quick of working out roughly what the answer is