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Add 15/18 and 18/72

15/18 + 18/72 is 13/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 72 is 72

    Next, find the equivalent fraction of both fractional numbers with denominator 72
  2. For the 1st fraction, since 18 × 4 = 72,
    15/18 = 15 × 4/18 × 4 = 60/72
  3. Likewise, for the 2nd fraction, since 72 × 1 = 72,
    18/72 = 18 × 1/72 × 1 = 18/72
  4. Add the two like fractions:
    60/72 + 18/72 = 60 + 18/72 = 78/72
  5. 78/72 simplified gives 13/12
  6. So, 15/18 + 18/72 = 13/12
    In mixed form: 11/12

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