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Subtract 6/21 from 1/18

1/18 - 6/21 is -29/126.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 21 is 126
  2. For the 1st fraction, since 18 × 7 = 126,
    1/18 = 1 × 7/18 × 7 = 7/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    6/21 = 6 × 6/21 × 6 = 36/126
  4. Subtract the two fractions:
    7/126 - 36/126 = 7 - 36/126 = -29/126

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