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Subtract 21/20 from 12/18

1st number: 12/18, 2nd number: 1 1/20

12/18 - 21/20 is -23/60.

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,
    12/18 = 12 × 10/18 × 10 = 120/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    21/20 = 21 × 9/20 × 9 = 189/180
  4. Subtract the two like fractions:
    120/180 - 189/180 = 120 - 189/180 = -69/180
  5. After reducing the fraction, the answer is -23/60

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