Answers

Subtract 15/12 from 20/63

1^st number: 20/63, 2^nd number: 1 3/12

20/63 - 15/12 is -235/252.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 12 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 63 × 4 = 252,
   20/63 = 20 × 4/63 × 4 = 80/252
3. Likewise, for the 2nd fraction, since 12 × 21 = 252,
   15/12 = 15 × 21/12 × 21 = 315/252
4. Subtract the two like fractions:
   80/252 - 315/252 = 80 - 315/252 = -235/252

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