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Subtract 28/40 from 4/42

4/42 - 28/40 is -127/210.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 42 × 20 = 840,
    4/42 = 4 × 20/42 × 20 = 80/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    28/40 = 28 × 21/40 × 21 = 588/840
  4. Subtract the two like fractions:
    80/840 - 588/840 = 80 - 588/840 = -508/840
  5. After reducing the fraction, the answer is -127/210

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