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Subtract 20/21 from 5/56

5/56 - 20/21 is -145/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 21 is 168
  2. For the 1st fraction, since 56 × 3 = 168,
    5/56 = 5 × 3/56 × 3 = 15/168
  3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
    20/21 = 20 × 8/21 × 8 = 160/168
  4. Subtract the two fractions:
    15/168 - 160/168 = 15 - 160/168 = -145/168

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