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Subtract 28/18 from 90/80

1st number: 1 10/80, 2nd number: 1 10/18

90/80 - 28/18 is -31/72.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 18 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 80 × 9 = 720,
    90/80 = 90 × 9/80 × 9 = 810/720
  3. Likewise, for the 2nd fraction, since 18 × 40 = 720,
    28/18 = 28 × 40/18 × 40 = 1120/720
  4. Subtract the two like fractions:
    810/720 - 1120/720 = 810 - 1120/720 = -310/720
  5. After reducing the fraction, the answer is -31/72

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