Solutions by everydaycalculation.com

515 + 2136 is 1112.

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

LCM of 15 and 36 is**180**

Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 15 × 12 = 180,

515 = 5 × 1215 × 12 = 60180 - Likewise, for the 2nd fraction, since 36 × 5 = 180,

2136 = 21 × 536 × 5 = 105180 - Add the two like fractions:

60180 + 105180 = 60 + 105180 = 165180 - 165/180 simplified gives 1112
- So, 5/15 + 21/36 = 11/12

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