Answers

Subtract 63/20 from 21/16

1^st number: 1 5/16, 2^nd number: 3 3/20

21/16 - 63/20 is -147/80.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 16 and 20 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 16 × 5 = 80,
   21/16 = 21 × 5/16 × 5 = 105/80
3. Likewise, for the 2nd fraction, since 20 × 4 = 80,
   63/20 = 63 × 4/20 × 4 = 252/80
4. Subtract the two like fractions:
   105/80 - 252/80 = 105 - 252/80 = -147/80

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