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Subtract 18/80 from 4/45

4/45 - 18/80 is -49/360.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 80 is 720

    Next, find the equivalent fraction of both fractional numbers with denominator 720
  2. For the 1st fraction, since 45 × 16 = 720,
    4/45 = 4 × 16/45 × 16 = 64/720
  3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
    18/80 = 18 × 9/80 × 9 = 162/720
  4. Subtract the two like fractions:
    64/720 - 162/720 = 64 - 162/720 = -98/720
  5. After reducing the fraction, the answer is -49/360

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