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Subtract 8/10 from 10/21

10/21 - 8/10 is -34/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 10 is 210
  2. For the 1st fraction, since 21 × 10 = 210,
    10/21 = 10 × 10/21 × 10 = 100/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    8/10 = 8 × 21/10 × 21 = 168/210
  4. Subtract the two fractions:
    100/210 - 168/210 = 100 - 168/210 = -68/210
  5. After reducing the fraction, the answer is -34/105

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