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Subtract 15/20 from 4/42

4/42 - 15/20 is -55/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 42 × 10 = 420,
    4/42 = 4 × 10/42 × 10 = 40/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    15/20 = 15 × 21/20 × 21 = 315/420
  4. Subtract the two like fractions:
    40/420 - 315/420 = 40 - 315/420 = -275/420
  5. After reducing the fraction, the answer is -55/84

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