Subtract 18/81 from 9/10, Solve 9/10

Subtract 18/81 from 9/10

9/10 - 18/81 is 61/90.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 81 is 810

Next, find the equivalent fraction of both fractional numbers with denominator 810
For the 1st fraction, since 10 × 81 = 810,
9/10 = 9 × 81/10 × 81 = 729/810
Likewise, for the 2nd fraction, since 81 × 10 = 810,
18/81 = 18 × 10/81 × 10 = 180/810
Subtract the two like fractions:
729/810 - 180/810 = 729 - 180/810 = 549/810
After reducing the fraction, the answer is 61/90

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