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Subtract 28/30 from 1/40

1/40 - 28/30 is -109/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 30 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 40 × 3 = 120,
    1/40 = 1 × 3/40 × 3 = 3/120
  3. Likewise, for the 2nd fraction, since 30 × 4 = 120,
    28/30 = 28 × 4/30 × 4 = 112/120
  4. Subtract the two like fractions:
    3/120 - 112/120 = 3 - 112/120 = -109/120

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