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Subtract 56/80 from 28/42

28/42 - 56/80 is -1/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680
  2. For the 1st fraction, since 42 × 40 = 1680,
    28/42 = 28 × 40/42 × 40 = 1120/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    56/80 = 56 × 21/80 × 21 = 1176/1680
  4. Subtract the two fractions:
    1120/1680 - 1176/1680 = 1120 - 1176/1680 = -56/1680
  5. After reducing the fraction, the answer is -1/30

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