Answers

Subtract 21/20 from 4/27

1^st number: 4/27, 2^nd number: 1 1/20

4/27 - 21/20 is -487/540.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 27 and 20 is 540
   
   Next, find the equivalent fraction of both fractional numbers with denominator 540
2. For the 1st fraction, since 27 × 20 = 540,
   4/27 = 4 × 20/27 × 20 = 80/540
3. Likewise, for the 2nd fraction, since 20 × 27 = 540,
   21/20 = 21 × 27/20 × 27 = 567/540
4. Subtract the two like fractions:
   80/540 - 567/540 = 80 - 567/540 = -487/540

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