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Subtract 3/7 from 10/42

10/42 - 3/7 is -4/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 7 is 42
  2. For the 1st fraction, since 42 × 1 = 42,
    10/42 = 10 × 1/42 × 1 = 10/42
  3. Likewise, for the 2nd fraction, since 7 × 6 = 42,
    3/7 = 3 × 6/7 × 6 = 18/42
  4. Subtract the two fractions:
    10/42 - 18/42 = 10 - 18/42 = -8/42
  5. After reducing the fraction, the answer is -4/21

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