Answers

Subtract 16/7 from 21/12

1^st number: 1 9/12, 2^nd number: 2 2/7

21/12 - 16/7 is -15/28.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 7 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 12 × 7 = 84,
   21/12 = 21 × 7/12 × 7 = 147/84
3. Likewise, for the 2nd fraction, since 7 × 12 = 84,
   16/7 = 16 × 12/7 × 12 = 192/84
4. Subtract the two like fractions:
   147/84 - 192/84 = 147 - 192/84 = -45/84
5. After reducing the fraction, the answer is -15/28

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