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Subtract 9/20 from 15/42

15/42 - 9/20 is -13/140.

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,
    15/42 = 15 × 10/42 × 10 = 150/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    9/20 = 9 × 21/20 × 21 = 189/420
  4. Subtract the two fractions:
    150/420 - 189/420 = 150 - 189/420 = -39/420
  5. After reducing the fraction, the answer is -13/140

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