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Subtract 10/42 from 1/8

1/8 - 10/42 is -19/168.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 8 × 21 = 168,
    1/8 = 1 × 21/8 × 21 = 21/168
  3. Likewise, for the 2nd fraction, since 42 × 4 = 168,
    10/42 = 10 × 4/42 × 4 = 40/168
  4. Subtract the two like fractions:
    21/168 - 40/168 = 21 - 40/168 = -19/168

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