Answers

Subtract 24/12 from 27/21

1^st number: 1 6/21, 2^nd number: 2 0/12

27/21 - 24/12 is -5/7.

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,
   27/21 = 27 × 4/21 × 4 = 108/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   24/12 = 24 × 7/12 × 7 = 168/84
4. Subtract the two like fractions:
   108/84 - 168/84 = 108 - 168/84 = -60/84
5. After reducing the fraction, the answer is -5/7

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