Answers

Subtract 20/30 from 5/81

5/81 - 20/30 is -49/81.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 30 is 810
   
   Next, find the equivalent fraction of both fractional numbers with denominator 810
2. For the 1st fraction, since 81 × 10 = 810,
   5/81 = 5 × 10/81 × 10 = 50/810
3. Likewise, for the 2nd fraction, since 30 × 27 = 810,
   20/30 = 20 × 27/30 × 27 = 540/810
4. Subtract the two like fractions:
   50/810 - 540/810 = 50 - 540/810 = -490/810
5. After reducing the fraction, the answer is -49/81

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