Answers

Subtract 5/81 from 9/10

9/10 - 5/81 is 679/810.

Steps for subtracting fractions

1. 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
2. For the 1st fraction, since 10 × 81 = 810,
   9/10 = 9 × 81/10 × 81 = 729/810
3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
   5/81 = 5 × 10/81 × 10 = 50/810
4. Subtract the two like fractions:
   729/810 - 50/810 = 729 - 50/810 = 679/810

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