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Subtract 40/80 from 20/90

20/90 - 40/80 is -5/18.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 80 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 90 × 8 = 720,
    20/90 = 20 × 8/90 × 8 = 160/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    40/80 = 40 × 9/80 × 9 = 360/720
  4. Subtract the two like fractions:
    160/720 - 360/720 = 160 - 360/720 = -200/720
  5. After reducing the fraction, the answer is -5/18

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