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Subtract 6/8 from 10/21

10/21 - 6/8 is -23/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 21 × 8 = 168,
    10/21 = 10 × 8/21 × 8 = 80/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    6/8 = 6 × 21/8 × 21 = 126/168
  4. Subtract the two like fractions:
    80/168 - 126/168 = 80 - 126/168 = -46/168
  5. After reducing the fraction, the answer is -23/84

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