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Subtract 3/81 from 21/25

21/25 - 3/81 is 542/675.

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,
    21/25 = 21 × 81/25 × 81 = 1701/2025
  3. Likewise, for the 2nd fraction, since 81 × 25 = 2025,
    3/81 = 3 × 25/81 × 25 = 75/2025
  4. Subtract the two fractions:
    1701/2025 - 75/2025 = 1701 - 75/2025 = 1626/2025
  5. After reducing the fraction, the answer is 542/675

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