Answers

Subtract 21/12 from 40/54

1^st number: 40/54, 2^nd number: 1 9/12

40/54 - 21/12 is -109/108.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 12 is 108
   
   Next, find the equivalent fraction of both fractional numbers with denominator 108
2. For the 1st fraction, since 54 × 2 = 108,
   40/54 = 40 × 2/54 × 2 = 80/108
3. Likewise, for the 2nd fraction, since 12 × 9 = 108,
   21/12 = 21 × 9/12 × 9 = 189/108
4. Subtract the two like fractions:
   80/108 - 189/108 = 80 - 189/108 = -109/108

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