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Subtract 16/90 from 21/25

21/25 - 16/90 is 149/225.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 25 and 90 is 450
  2. For the 1st fraction, since 25 × 18 = 450,
    21/25 = 21 × 18/25 × 18 = 378/450
  3. Likewise, for the 2nd fraction, since 90 × 5 = 450,
    16/90 = 16 × 5/90 × 5 = 80/450
  4. Subtract the two fractions:
    378/450 - 80/450 = 378 - 80/450 = 298/450
  5. After reducing the fraction, the answer is 149/225

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