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Subtract 14/21 from 7/18

7/18 - 14/21 is -5/18.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 21 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 18 × 7 = 126,
    7/18 = 7 × 7/18 × 7 = 49/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    14/21 = 14 × 6/21 × 6 = 84/126
  4. Subtract the two like fractions:
    49/126 - 84/126 = 49 - 84/126 = -35/126
  5. After reducing the fraction, the answer is -5/18

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