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Subtract 9/20 from 90/18

1st number: 5 0/18, 2nd number: 9/20

90/18 - 9/20 is 91/20.

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,
    90/18 = 90 × 10/18 × 10 = 900/180
  3. Likewise, for the 2nd fraction, since 20 × 9 = 180,
    9/20 = 9 × 9/20 × 9 = 81/180
  4. Subtract the two like fractions:
    900/180 - 81/180 = 900 - 81/180 = 819/180
  5. After reducing the fraction, the answer is 91/20
  6. In mixed form: 411/20

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