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Subtract 18/40 from 30/80

30/80 - 18/40 is -3/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 40 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 80
  2. For the 1st fraction, since 80 × 1 = 80,
    30/80 = 30 × 1/80 × 1 = 30/80
  3. Likewise, for the 2nd fraction, since 40 × 2 = 80,
    18/40 = 18 × 2/40 × 2 = 36/80
  4. Subtract the two like fractions:
    30/80 - 36/80 = 30 - 36/80 = -6/80
  5. After reducing the fraction, the answer is -3/40

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