Answers

Subtract 63/12 from 75/21

1^st number: 3 12/21, 2^nd number: 5 3/12

75/21 - 63/12 is -47/28.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 12 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 21 × 4 = 84,
   75/21 = 75 × 4/21 × 4 = 300/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   63/12 = 63 × 7/12 × 7 = 441/84
4. Subtract the two like fractions:
   300/84 - 441/84 = 300 - 441/84 = -141/84
5. After reducing the fraction, the answer is -47/28

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