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Subtract 8/21 from 21/2

1st number: 10 1/2, 2nd number: 8/21

21/2 - 8/21 is 425/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 2 and 21 is 42
  2. For the 1st fraction, since 2 × 21 = 42,
    21/2 = 21 × 21/2 × 21 = 441/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    8/21 = 8 × 2/21 × 2 = 16/42
  4. Subtract the two fractions:
    441/42 - 16/42 = 441 - 16/42 = 425/42
  5. In mixed form: 105/42

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