9/10 of 90 = 9*90/10 = 9*9 = 81
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nine tenths is 90% and four fifths is 80% so nine tenths is bigger
Nine tenths is 90%, that is, nine units of a whole item which consists of ten units in total.
Nine
90 of them.
If you mean 90 - 9/10, then the answer's 89 1/10. If you mean 90 - nine-tenths of 90 [90 - 9/10(90)], then the answer's 9.