Answers

Subtract 1/20 from 5/81

5/81 - 1/20 is 19/1620.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 20 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 81 × 20 = 1620,
   5/81 = 5 × 20/81 × 20 = 100/1620
3. Likewise, for the 2nd fraction, since 20 × 81 = 1620,
   1/20 = 1 × 81/20 × 81 = 81/1620
4. Subtract the two like fractions:
   100/1620 - 81/1620 = 100 - 81/1620 = 19/1620

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