Answers

Subtract 27/20 from 5/21

1^st number: 5/21, 2^nd number: 1 7/20

5/21 - 27/20 is -467/420.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 21 × 20 = 420,
   5/21 = 5 × 20/21 × 20 = 100/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   27/20 = 27 × 21/20 × 21 = 567/420
4. Subtract the two like fractions:
   100/420 - 567/420 = 100 - 567/420 = -467/420

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