10% of 90 is 9. The easiest way to find this answer is to simply drop the zero from 90 to find 10%. This works with any number ending in zero (i.e. 10% of 50 is 5, 10% of 2,000 is 200). If you want to find 10% of a number that doesn't end in zero, just move the decimal one place to the left (i.e. 10% of 99 is 9.9, 10% of 35 is 3.5).
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10% of 90 = 990% 0f 10 = 9(10% of 90) + (90% of 10) = 18
90% of 10 = 0.90 x 10 = 980% of 90% of 10 = 0.80 x 9 = 7.2
90 percent out of 100 percent = 9/10 or 0.990%/100% = 9/10 or 0.9
90+10 divided by 2=50
90% = 90/100 or 9/10 in fraction