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Subtract 42/15 from 1/18

1st number: 1/18, 2nd number: 2 12/15

1/18 - 42/15 is -247/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 15 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 18 × 5 = 90,
    1/18 = 1 × 5/18 × 5 = 5/90
  3. Likewise, for the 2nd fraction, since 15 × 6 = 90,
    42/15 = 42 × 6/15 × 6 = 252/90
  4. Subtract the two like fractions:
    5/90 - 252/90 = 5 - 252/90 = -247/90

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