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Subtract 42/90 from 8/12

8/12 - 42/90 is 1/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 90 is 180

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 12 × 15 = 180,
    8/12 = 8 × 15/12 × 15 = 120/180
  3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
    42/90 = 42 × 2/90 × 2 = 84/180
  4. Subtract the two like fractions:
    120/180 - 84/180 = 120 - 84/180 = 36/180
  5. After reducing the fraction, the answer is 1/5

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