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Subtract 18/35 from 9/20

9/20 - 18/35 is -9/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 35 is 140
  2. For the 1st fraction, since 20 × 7 = 140,
    9/20 = 9 × 7/20 × 7 = 63/140
  3. Likewise, for the 2nd fraction, since 35 × 4 = 140,
    18/35 = 18 × 4/35 × 4 = 72/140
  4. Subtract the two fractions:
    63/140 - 72/140 = 63 - 72/140 = -9/140

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