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Subtract 70/80 from 40/42

40/42 - 70/80 is 13/168.

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,
    40/42 = 40 × 40/42 × 40 = 1600/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    70/80 = 70 × 21/80 × 21 = 1470/1680
  4. Subtract the two like fractions:
    1600/1680 - 1470/1680 = 1600 - 1470/1680 = 130/1680
  5. After reducing the fraction, the answer is 13/168

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