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Subtract 42/90 from 7/24

7/24 - 42/90 is -7/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 24 and 90 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 24 × 15 = 360,
    7/24 = 7 × 15/24 × 15 = 105/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    42/90 = 42 × 4/90 × 4 = 168/360
  4. Subtract the two like fractions:
    105/360 - 168/360 = 105 - 168/360 = -63/360
  5. After reducing the fraction, the answer is -7/40

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