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Subtract 15/20 from 3/18

3/18 - 15/20 is -7/12.

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,
    3/18 = 3 × 10/18 × 10 = 30/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    15/20 = 15 × 9/20 × 9 = 135/180
  4. Subtract the two like fractions:
    30/180 - 135/180 = 30 - 135/180 = -105/180
  5. After reducing the fraction, the answer is -7/12

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