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Subtract 20/90 from 5/42

5/42 - 20/90 is -13/126.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 42 × 15 = 630,
    5/42 = 5 × 15/42 × 15 = 75/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    20/90 = 20 × 7/90 × 7 = 140/630
  4. Subtract the two like fractions:
    75/630 - 140/630 = 75 - 140/630 = -65/630
  5. After reducing the fraction, the answer is -13/126

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