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Subtract 1/8 from 18/42

18/42 - 1/8 is 17/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 8 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 42 × 4 = 168,
    18/42 = 18 × 4/42 × 4 = 72/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    1/8 = 1 × 21/8 × 21 = 21/168
  4. Subtract the two like fractions:
    72/168 - 21/168 = 72 - 21/168 = 51/168
  5. After reducing the fraction, the answer is 17/56

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