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Add 28/21 and 81/4

1st number: 1 7/21, 2nd number: 20 1/4

28/21 + 81/4 is 259/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 4 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    28/21 = 28 × 4/21 × 4 = 112/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    81/4 = 81 × 21/4 × 21 = 1701/84
  4. Add the two like fractions:
    112/84 + 1701/84 = 112 + 1701/84 = 1813/84
  5. 1813/84 simplified gives 259/12
  6. So, 28/21 + 81/4 = 259/12
    In mixed form: 217/12

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