Answers

Subtract 27/21 from 18/12

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

18/12 - 27/21 is 3/14.

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,
   18/12 = 18 × 7/12 × 7 = 126/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   27/21 = 27 × 4/21 × 4 = 108/84
4. Subtract the two like fractions:
   126/84 - 108/84 = 126 - 108/84 = 18/84
5. After reducing the fraction, the answer is 3/14

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