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Subtract 9/18 from 7/20

7/20 - 9/18 is -3/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 18 is 180
  2. For the 1st fraction, since 20 × 9 = 180,
    7/20 = 7 × 9/20 × 9 = 63/180
  3. Likewise, for the 2nd fraction, since 18 × 10 = 180,
    9/18 = 9 × 10/18 × 10 = 90/180
  4. Subtract the two fractions:
    63/180 - 90/180 = 63 - 90/180 = -27/180
  5. After reducing the fraction, the answer is -3/20

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