Answers

Subtract 20/21 from 35/56

35/56 - 20/21 is -55/168.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 56 and 21 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 56 × 3 = 168,
   35/56 = 35 × 3/56 × 3 = 105/168
3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
   20/21 = 20 × 8/21 × 8 = 160/168
4. Subtract the two like fractions:
   105/168 - 160/168 = 105 - 160/168 = -55/168

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