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Subtract 40/70 from 30/84

30/84 - 40/70 is -3/14.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 84 × 5 = 420,
    30/84 = 30 × 5/84 × 5 = 150/420
  3. Likewise, for the 2nd fraction, since 70 × 6 = 420,
    40/70 = 40 × 6/70 × 6 = 240/420
  4. Subtract the two like fractions:
    150/420 - 240/420 = 150 - 240/420 = -90/420
  5. After reducing the fraction, the answer is -3/14

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