Answers

Subtract 40/21 from 16/12

1^st number: 1 4/12, 2^nd number: 1 19/21

16/12 - 40/21 is -4/7.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 21 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 12 × 7 = 84,
   16/12 = 16 × 7/12 × 7 = 112/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   40/21 = 40 × 4/21 × 4 = 160/84
4. Subtract the two like fractions:
   112/84 - 160/84 = 112 - 160/84 = -48/84
5. After reducing the fraction, the answer is -4/7

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