Answers

Subtract 25/12 from 28/21

1^st number: 1 7/21, 2^nd number: 2 1/12

28/21 - 25/12 is -3/4.

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,
   28/21 = 28 × 4/21 × 4 = 112/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   25/12 = 25 × 7/12 × 7 = 175/84
4. Subtract the two like fractions:
   112/84 - 175/84 = 112 - 175/84 = -63/84
5. After reducing the fraction, the answer is -3/4

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