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Subtract 12/20 from 1/18

1/18 - 12/20 is -49/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 20 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 18 × 10 = 180,
    1/18 = 1 × 10/18 × 10 = 10/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    12/20 = 12 × 9/20 × 9 = 108/180
  4. Subtract the two like fractions:
    10/180 - 108/180 = 10 - 108/180 = -98/180
  5. After reducing the fraction, the answer is -49/90

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