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Subtract 1/40 from 12/90

12/90 - 1/40 is 13/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 40 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 90 × 4 = 360,
    12/90 = 12 × 4/90 × 4 = 48/360
  3. Likewise, for the 2nd fraction, since 40 × 9 = 360,
    1/40 = 1 × 9/40 × 9 = 9/360
  4. Subtract the two like fractions:
    48/360 - 9/360 = 48 - 9/360 = 39/360
  5. After reducing the fraction, the answer is 13/120

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