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Subtract 90/81 from 4/45

1st number: 4/45, 2nd number: 1 9/81

4/45 - 90/81 is -46/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 45 and 81 is 405
  2. For the 1st fraction, since 45 × 9 = 405,
    4/45 = 4 × 9/45 × 9 = 36/405
  3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
    90/81 = 90 × 5/81 × 5 = 450/405
  4. Subtract the two fractions:
    36/405 - 450/405 = 36 - 450/405 = -414/405
  5. After reducing the fraction, the answer is -46/45

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