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Subtract 18/21 from 1/12

1/12 - 18/21 is -65/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 21 is 84
  2. For the 1st fraction, since 12 × 7 = 84,
    1/12 = 1 × 7/12 × 7 = 7/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    18/21 = 18 × 4/21 × 4 = 72/84
  4. Subtract the two fractions:
    7/84 - 72/84 = 7 - 72/84 = -65/84

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