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Subtract 16/81 from 21/4

1st number: 5 1/4, 2nd number: 16/81

21/4 - 16/81 is 1637/324.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 81 is 324
  2. For the 1st fraction, since 4 × 81 = 324,
    21/4 = 21 × 81/4 × 81 = 1701/324
  3. Likewise, for the 2nd fraction, since 81 × 4 = 324,
    16/81 = 16 × 4/81 × 4 = 64/324
  4. Subtract the two fractions:
    1701/324 - 64/324 = 1701 - 64/324 = 1637/324
  5. In mixed form: 517/324

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