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Subtract 72/18 from 9/5

1st number: 1 4/5, 2nd number: 4 0/18

9/5 - 72/18 is -11/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 18 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 5 × 18 = 90,
    9/5 = 9 × 18/5 × 18 = 162/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    72/18 = 72 × 5/18 × 5 = 360/90
  4. Subtract the two like fractions:
    162/90 - 360/90 = 162 - 360/90 = -198/90
  5. After reducing the fraction, the answer is -11/5

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