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Subtract 10/21 from 1/8

1/8 - 10/21 is -59/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 21 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 21 × 8 = 168,
    10/21 = 10 × 8/21 × 8 = 80/168
  4. Subtract the two like fractions:
    21/168 - 80/168 = 21 - 80/168 = -59/168

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