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Add 12/15 and 21/27

12/15 + 21/27 is 71/45.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 27 is 135

    Next, find the equivalent fraction of both fractional numbers with denominator 135
  2. For the 1st fraction, since 15 × 9 = 135,
    12/15 = 12 × 9/15 × 9 = 108/135
  3. Likewise, for the 2nd fraction, since 27 × 5 = 135,
    21/27 = 21 × 5/27 × 5 = 105/135
  4. Add the two like fractions:
    108/135 + 105/135 = 108 + 105/135 = 213/135
  5. 213/135 simplified gives 71/45
  6. So, 12/15 + 21/27 = 71/45
    In mixed form: 126/45

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