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Subtract 21/16 from 7/21

1st number: 7/21, 2nd number: 1 5/16

7/21 - 21/16 is -47/48.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 16 is 336
  2. For the 1st fraction, since 21 × 16 = 336,
    7/21 = 7 × 16/21 × 16 = 112/336
  3. Likewise, for the 2nd fraction, since 16 × 21 = 336,
    21/16 = 21 × 21/16 × 21 = 441/336
  4. Subtract the two fractions:
    112/336 - 441/336 = 112 - 441/336 = -329/336
  5. After reducing the fraction, the answer is -47/48

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