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Subtract 21/81 from 18/25

18/25 - 21/81 is 311/675.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 25 and 81 is 2025

    Next, find the equivalent fraction of both fractional numbers with denominator 2025
  2. For the 1st fraction, since 25 × 81 = 2025,
    18/25 = 18 × 81/25 × 81 = 1458/2025
  3. Likewise, for the 2nd fraction, since 81 × 25 = 2025,
    21/81 = 21 × 25/81 × 25 = 525/2025
  4. Subtract the two like fractions:
    1458/2025 - 525/2025 = 1458 - 525/2025 = 933/2025
  5. After reducing the fraction, the answer is 311/675

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