Answers

Subtract 80/63 from 21/12

1^st number: 1 9/12, 2^nd number: 1 17/63

21/12 - 80/63 is 121/252.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 63 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 12 × 21 = 252,
   21/12 = 21 × 21/12 × 21 = 441/252
3. Likewise, for the 2nd fraction, since 63 × 4 = 252,
   80/63 = 80 × 4/63 × 4 = 320/252
4. Subtract the two like fractions:
   441/252 - 320/252 = 441 - 320/252 = 121/252

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