math very urgent
posted by Anonymous .
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.

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