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Subtract 21/80 from 14/42

14/42 - 21/80 is 17/240.

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,
    14/42 = 14 × 40/42 × 40 = 560/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    21/80 = 21 × 21/80 × 21 = 441/1680
  4. Subtract the two like fractions:
    560/1680 - 441/1680 = 560 - 441/1680 = 119/1680
  5. After reducing the fraction, the answer is 17/240

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