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Subtract 9/20 from 1/9

1/9 - 9/20 is -61/180.

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,
    1/9 = 1 × 20/9 × 20 = 20/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    9/20 = 9 × 9/20 × 9 = 81/180
  4. Subtract the two like fractions:
    20/180 - 81/180 = 20 - 81/180 = -61/180

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