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Subtract 5/18 from 7/90

7/90 - 5/18 is -1/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 18 is 90
  2. For the 1st fraction, since 90 × 1 = 90,
    7/90 = 7 × 1/90 × 1 = 7/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    5/18 = 5 × 5/18 × 5 = 25/90
  4. Subtract the two fractions:
    7/90 - 25/90 = 7 - 25/90 = -18/90
  5. After reducing the fraction, the answer is -1/5

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