Answers

Subtract 40/12 from 25/21

1^st number: 1 4/21, 2^nd number: 3 4/12

25/21 - 40/12 is -15/7.

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,
   25/21 = 25 × 4/21 × 4 = 100/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   40/12 = 40 × 7/12 × 7 = 280/84
4. Subtract the two like fractions:
   100/84 - 280/84 = 100 - 280/84 = -180/84
5. After reducing the fraction, the answer is -15/7

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