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Subtract 12/20 from 5/9

5/9 - 12/20 is -2/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 20 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 9 × 20 = 180,
    5/9 = 5 × 20/9 × 20 = 100/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    12/20 = 12 × 9/20 × 9 = 108/180
  4. Subtract the two like fractions:
    100/180 - 108/180 = 100 - 108/180 = -8/180
  5. After reducing the fraction, the answer is -2/45

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