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Add 21/2 and 28/21

1st number: 10 1/2, 2nd number: 1 7/21

21/2 + 28/21 is 71/6.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 2 and 21 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 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,
    28/21 = 28 × 2/21 × 2 = 56/42
  4. Add the two like fractions:
    441/42 + 56/42 = 441 + 56/42 = 497/42
  5. 497/42 simplified gives 71/6
  6. So, 21/2 + 28/21 = 71/6
    In mixed form: 115/6

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