Answers

Subtract 28/56 from 1/42

1/42 - 28/56 is -10/21.

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,
   1/42 = 1 × 4/42 × 4 = 4/168
3. Likewise, for the 2nd fraction, since 56 × 3 = 168,
   28/56 = 28 × 3/56 × 3 = 84/168
4. Subtract the two like fractions:
   4/168 - 84/168 = 4 - 84/168 = -80/168
5. After reducing the fraction, the answer is -10/21

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