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Subtract 21/81 from 3/25

3/25 - 21/81 is -94/675.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 25 and 81 is 2025
  2. For the 1st fraction, since 25 × 81 = 2025,
    3/25 = 3 × 81/25 × 81 = 243/2025
  3. Likewise, for the 2nd fraction, since 81 × 25 = 2025,
    21/81 = 21 × 25/81 × 25 = 525/2025
  4. Subtract the two fractions:
    243/2025 - 525/2025 = 243 - 525/2025 = -282/2025
  5. After reducing the fraction, the answer is -94/675

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