Answers

Subtract 81/56 from 5/42

1^st number: 5/42, 2^nd number: 1 25/56

5/42 - 81/56 is -223/168.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 56 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 42 × 4 = 168,
   5/42 = 5 × 4/42 × 4 = 20/168
3. Likewise, for the 2nd fraction, since 56 × 3 = 168,
   81/56 = 81 × 3/56 × 3 = 243/168
4. Subtract the two like fractions:
   20/168 - 243/168 = 20 - 243/168 = -223/168

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