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Subtract 18/40 from 30/84

30/84 - 18/40 is -13/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 40 is 840
  2. For the 1st fraction, since 84 × 10 = 840,
    30/84 = 30 × 10/84 × 10 = 300/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    18/40 = 18 × 21/40 × 21 = 378/840
  4. Subtract the two fractions:
    300/840 - 378/840 = 300 - 378/840 = -78/840
  5. After reducing the fraction, the answer is -13/140

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