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Add 21/28 and 12/27

21/28 + 12/27 is 43/36.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 756
  2. For the 1st fraction, since 28 × 27 = 756,
    21/28 = 21 × 27/28 × 27 = 567/756
  3. Likewise, for the 2nd fraction, since 27 × 28 = 756,
    12/27 = 12 × 28/27 × 28 = 336/756
  4. Add the two like fractions:
    567/756 + 336/756 = 567 + 336/756 = 903/756
  5. 903/756 simplified gives 43/36
  6. So, 21/28 + 12/27 = 43/36
    In mixed form: 17/36

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