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Subtract 15/90 from 10/42

10/42 - 15/90 is 1/14.

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,
    10/42 = 10 × 15/42 × 15 = 150/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    15/90 = 15 × 7/90 × 7 = 105/630
  4. Subtract the two like fractions:
    150/630 - 105/630 = 150 - 105/630 = 45/630
  5. After reducing the fraction, the answer is 1/14

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