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Subtract 40/84 from 20/70

20/70 - 40/84 is -4/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 84 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 70 × 6 = 420,
    20/70 = 20 × 6/70 × 6 = 120/420
  3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
    40/84 = 40 × 5/84 × 5 = 200/420
  4. Subtract the two like fractions:
    120/420 - 200/420 = 120 - 200/420 = -80/420
  5. After reducing the fraction, the answer is -4/21

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