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Subtract 42/45 from 4/42

4/42 - 42/45 is -88/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 45 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 42 × 15 = 630,
    4/42 = 4 × 15/42 × 15 = 60/630
  3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
    42/45 = 42 × 14/45 × 14 = 588/630
  4. Subtract the two like fractions:
    60/630 - 588/630 = 60 - 588/630 = -528/630
  5. After reducing the fraction, the answer is -88/105

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