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Subtract 42/80 from 28/42

28/42 - 42/80 is 17/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 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,
    42/80 = 42 × 21/80 × 21 = 882/1680
  4. Subtract the two like fractions:
    1120/1680 - 882/1680 = 1120 - 882/1680 = 238/1680
  5. After reducing the fraction, the answer is 17/120

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