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Subtract 45/18 from 4/5

1st number: 4/5, 2nd number: 2 9/18

4/5 - 45/18 is -17/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 18 is 90
  2. For the 1st fraction, since 5 × 18 = 90,
    4/5 = 4 × 18/5 × 18 = 72/90
  3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
    45/18 = 45 × 5/18 × 5 = 225/90
  4. Subtract the two fractions:
    72/90 - 225/90 = 72 - 225/90 = -153/90
  5. After reducing the fraction, the answer is -17/10

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