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Add 21/27 and 9/28

21/27 + 9/28 is 277/252.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 27 and 28 is 756

    Next, find the equivalent fraction of both fractional numbers with denominator 756
  2. For the 1st fraction, since 27 × 28 = 756,
    21/27 = 21 × 28/27 × 28 = 588/756
  3. Likewise, for the 2nd fraction, since 28 × 27 = 756,
    9/28 = 9 × 27/28 × 27 = 243/756
  4. Add the two like fractions:
    588/756 + 243/756 = 588 + 243/756 = 831/756
  5. 831/756 simplified gives 277/252
  6. So, 21/27 + 9/28 = 277/252
    In mixed form: 125/252

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