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Subtract 5/90 from 1/42

1/42 - 5/90 is -2/63.

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,
    1/42 = 1 × 15/42 × 15 = 15/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    5/90 = 5 × 7/90 × 7 = 35/630
  4. Subtract the two like fractions:
    15/630 - 35/630 = 15 - 35/630 = -20/630
  5. After reducing the fraction, the answer is -2/63

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