Answers

Subtract 5/81 from 7/15

7/15 - 5/81 is 164/405.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 81 is 405
   
   Next, find the equivalent fraction of both fractional numbers with denominator 405
2. For the 1st fraction, since 15 × 27 = 405,
   7/15 = 7 × 27/15 × 27 = 189/405
3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
   5/81 = 5 × 5/81 × 5 = 25/405
4. Subtract the two like fractions:
   189/405 - 25/405 = 189 - 25/405 = 164/405

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