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Subtract 40/42 from 10/21

10/21 - 40/42 is -10/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 42 is 42
  2. For the 1st fraction, since 21 × 2 = 42,
    10/21 = 10 × 2/21 × 2 = 20/42
  3. Likewise, for the 2nd fraction, since 42 × 1 = 42,
    40/42 = 40 × 1/42 × 1 = 40/42
  4. Subtract the two fractions:
    20/42 - 40/42 = 20 - 40/42 = -20/42
  5. After reducing the fraction, the answer is -10/21

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