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Subtract 15/4 from 20/42

1st number: 20/42, 2nd number: 3 3/4

20/42 - 15/4 is -275/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 4 is 84

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

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