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Subtract 4/5 from 21/56

21/56 - 4/5 is -17/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 56 and 5 is 280

    Next, find the equivalent fraction of both fractional numbers with denominator 280
  2. For the 1st fraction, since 56 × 5 = 280,
    21/56 = 21 × 5/56 × 5 = 105/280
  3. Likewise, for the 2nd fraction, since 5 × 56 = 280,
    4/5 = 4 × 56/5 × 56 = 224/280
  4. Subtract the two like fractions:
    105/280 - 224/280 = 105 - 224/280 = -119/280
  5. After reducing the fraction, the answer is -17/40

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