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Subtract 18/24 from 28/90

28/90 - 18/24 is -79/180.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 90 × 4 = 360,
    28/90 = 28 × 4/90 × 4 = 112/360
  3. Likewise, for the 2nd fraction, since 24 × 15 = 360,
    18/24 = 18 × 15/24 × 15 = 270/360
  4. Subtract the two like fractions:
    112/360 - 270/360 = 112 - 270/360 = -158/360
  5. After reducing the fraction, the answer is -79/180

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