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Subtract 72/81 from 90/75

1st number: 1 15/75, 2nd number: 72/81

90/75 - 72/81 is 14/45.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 75 and 81 is 2025
  2. For the 1st fraction, since 75 × 27 = 2025,
    90/75 = 90 × 27/75 × 27 = 2430/2025
  3. Likewise, for the 2nd fraction, since 81 × 25 = 2025,
    72/81 = 72 × 25/81 × 25 = 1800/2025
  4. Subtract the two fractions:
    2430/2025 - 1800/2025 = 2430 - 1800/2025 = 630/2025
  5. After reducing the fraction, the answer is 14/45

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