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Subtract 20/12 from 56/90

1st number: 56/90, 2nd number: 1 8/12

56/90 - 20/12 is -47/45.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 180
  2. For the 1st fraction, since 90 × 2 = 180,
    56/90 = 56 × 2/90 × 2 = 112/180
  3. Likewise, for the 2nd fraction, since 12 × 15 = 180,
    20/12 = 20 × 15/12 × 15 = 300/180
  4. Subtract the two like fractions:
    112/180 - 300/180 = 112 - 300/180 = -188/180
  5. After reducing the fraction, the answer is -47/45

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