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Subtract 18/28 from 5/15

5/15 - 18/28 is -13/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 28 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 15 × 28 = 420,
    5/15 = 5 × 28/15 × 28 = 140/420
  3. Likewise, for the 2nd fraction, since 28 × 15 = 420,
    18/28 = 18 × 15/28 × 15 = 270/420
  4. Subtract the two like fractions:
    140/420 - 270/420 = 140 - 270/420 = -130/420
  5. After reducing the fraction, the answer is -13/42

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