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Subtract 4/10 from 8/21

8/21 - 4/10 is -2/105.

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,
    8/21 = 8 × 10/21 × 10 = 80/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    4/10 = 4 × 21/10 × 21 = 84/210
  4. Subtract the two fractions:
    80/210 - 84/210 = 80 - 84/210 = -4/210
  5. After reducing the fraction, the answer is -2/105

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