Answers

Subtract 90/54 from 81/56

1^st number: 1 25/56, 2^nd number: 1 36/54

81/56 - 90/54 is -37/168.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 56 and 54 is 1512
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1512
2. For the 1st fraction, since 56 × 27 = 1512,
   81/56 = 81 × 27/56 × 27 = 2187/1512
3. Likewise, for the 2nd fraction, since 54 × 28 = 1512,
   90/54 = 90 × 28/54 × 28 = 2520/1512
4. Subtract the two like fractions:
   2187/1512 - 2520/1512 = 2187 - 2520/1512 = -333/1512
5. After reducing the fraction, the answer is -37/168

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