Question

First, do you get the same sum when you use 18 rather than 9 as a common denominator for 2/3 and 4/9? Explain the answer.

Also what extra step will you have to perform if you do not use the least common denominator when adding fractions?
Please explain the answer.

Answer 1

You will get the same answer
The extra would be putting your answer in lowest terms

6/9 + 4/9 = 10/9

12/18 + 8/18= 20/18 = 10/9