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Subtract 7/42 from 7/90

7/90 - 7/42 is -4/45.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    7/90 = 7 × 7/90 × 7 = 49/630
  3. Likewise, for the 2nd fraction, since 42 × 15 = 630,
    7/42 = 7 × 15/42 × 15 = 105/630
  4. Subtract the two like fractions:
    49/630 - 105/630 = 49 - 105/630 = -56/630
  5. After reducing the fraction, the answer is -4/45

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