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Subtract 15/18 from 30/84

30/84 - 15/18 is -10/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 18 is 252

    Next, find the equivalent fraction of both fractional numbers with denominator 252
  2. For the 1st fraction, since 84 × 3 = 252,
    30/84 = 30 × 3/84 × 3 = 90/252
  3. Likewise, for the 2nd fraction, since 18 × 14 = 252,
    15/18 = 15 × 14/18 × 14 = 210/252
  4. Subtract the two like fractions:
    90/252 - 210/252 = 90 - 210/252 = -120/252
  5. After reducing the fraction, the answer is -10/21

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