Solutions by everydaycalculation.com

13 + 39 is 23.

- Find the least common denominator or LCM of the two denominators:

LCM of 3 and 9 is**9**

Next, find the equivalent fraction of both fractional numbers with denominator 9 - For the 1st fraction, since 3 × 3 = 9,

13 = 1 × 33 × 3 = 39 - Likewise, for the 2nd fraction, since 9 × 1 = 9,

39 = 3 × 19 × 1 = 39 - Add the two like fractions:

39 + 39 = 3 + 39 = 69 - 6/9 simplified gives 23
- So, 1/3 + 3/9 = 2/3

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