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Subtract 12/20 from 10/42

10/42 - 12/20 is -38/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420
  2. For the 1st fraction, since 42 × 10 = 420,
    10/42 = 10 × 10/42 × 10 = 100/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    12/20 = 12 × 21/20 × 21 = 252/420
  4. Subtract the two fractions:
    100/420 - 252/420 = 100 - 252/420 = -152/420
  5. After reducing the fraction, the answer is -38/105

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