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Subtract 20/42 from 15/28

15/28 - 20/42 is 5/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 42 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 28 × 3 = 84,
    15/28 = 15 × 3/28 × 3 = 45/84
  3. Likewise, for the 2nd fraction, since 42 × 2 = 84,
    20/42 = 20 × 2/42 × 2 = 40/84
  4. Subtract the two like fractions:
    45/84 - 40/84 = 45 - 40/84 = 5/84

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