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Add 12/18 and 21/30

12/18 + 21/30 is 41/30.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 30 is 90

    Next, find the equivalent fraction of both fractional numbers with denominator 90
  2. For the 1st fraction, since 18 × 5 = 90,
    12/18 = 12 × 5/18 × 5 = 60/90
  3. Likewise, for the 2nd fraction, since 30 × 3 = 90,
    21/30 = 21 × 3/30 × 3 = 63/90
  4. Add the two like fractions:
    60/90 + 63/90 = 60 + 63/90 = 123/90
  5. 123/90 simplified gives 41/30
  6. So, 12/18 + 21/30 = 41/30
    In mixed form: 111/30

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