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Subtract 4/9 from 18/20

18/20 - 4/9 is 41/90.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 20 × 9 = 180,
    18/20 = 18 × 9/20 × 9 = 162/180
  3. Likewise, for the 2nd fraction, since 9 × 20 = 180,
    4/9 = 4 × 20/9 × 20 = 80/180
  4. Subtract the two like fractions:
    162/180 - 80/180 = 162 - 80/180 = 82/180
  5. After reducing the fraction, the answer is 41/90

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