Answers

Subtract 90/56 from 72/54

1^st number: 1 18/54, 2^nd number: 1 34/56

72/54 - 90/56 is -23/84.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 56 is 1512
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1512
2. For the 1st fraction, since 54 × 28 = 1512,
   72/54 = 72 × 28/54 × 28 = 2016/1512
3. Likewise, for the 2nd fraction, since 56 × 27 = 1512,
   90/56 = 90 × 27/56 × 27 = 2430/1512
4. Subtract the two like fractions:
   2016/1512 - 2430/1512 = 2016 - 2430/1512 = -414/1512
5. After reducing the fraction, the answer is -23/84

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