Answers

Subtract 15/20 from 63/42

1^st number: 1 21/42, 2^nd number: 15/20

63/42 - 15/20 is 3/4.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 42 × 10 = 420,
   63/42 = 63 × 10/42 × 10 = 630/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   15/20 = 15 × 21/20 × 21 = 315/420
4. Subtract the two like fractions:
   630/420 - 315/420 = 630 - 315/420 = 315/420
5. After reducing the fraction, the answer is 3/4

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