Answers

Subtract 63/4 from 21/20

1^st number: 1 1/20, 2^nd number: 15 3/4

21/20 - 63/4 is -147/10.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 4 is 20
   
   Next, find the equivalent fraction of both fractional numbers with denominator 20
2. For the 1st fraction, since 20 × 1 = 20,
   21/20 = 21 × 1/20 × 1 = 21/20
3. Likewise, for the 2nd fraction, since 4 × 5 = 20,
   63/4 = 63 × 5/4 × 5 = 315/20
4. Subtract the two like fractions:
   21/20 - 315/20 = 21 - 315/20 = -294/20
5. After reducing the fraction, the answer is -147/10

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