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Subtract 18/36 from 10/42

10/42 - 18/36 is -11/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 36 is 252

    Next, find the equivalent fraction of both fractional numbers with denominator 252
  2. For the 1st fraction, since 42 × 6 = 252,
    10/42 = 10 × 6/42 × 6 = 60/252
  3. Likewise, for the 2nd fraction, since 36 × 7 = 252,
    18/36 = 18 × 7/36 × 7 = 126/252
  4. Subtract the two like fractions:
    60/252 - 126/252 = 60 - 126/252 = -66/252
  5. After reducing the fraction, the answer is -11/42

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