Answers

Subtract 2/81 from 4/72

4/72 - 2/81 is 5/162.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 81 is 648
   
   Next, find the equivalent fraction of both fractional numbers with denominator 648
2. For the 1st fraction, since 72 × 9 = 648,
   4/72 = 4 × 9/72 × 9 = 36/648
3. Likewise, for the 2nd fraction, since 81 × 8 = 648,
   2/81 = 2 × 8/81 × 8 = 16/648
4. Subtract the two like fractions:
   36/648 - 16/648 = 36 - 16/648 = 20/648
5. After reducing the fraction, the answer is 5/162

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