Answers

Subtract 48/81 from 21/20

1^st number: 1 1/20, 2^nd number: 48/81

21/20 - 48/81 is 247/540.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 81 is 1620
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1620
2. For the 1st fraction, since 20 × 81 = 1620,
   21/20 = 21 × 81/20 × 81 = 1701/1620
3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
   48/81 = 48 × 20/81 × 20 = 960/1620
4. Subtract the two like fractions:
   1701/1620 - 960/1620 = 1701 - 960/1620 = 741/1620
5. After reducing the fraction, the answer is 247/540

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