Posted by sam on .
Ann bought 2/3 lb of carrots 3/4lb of celery and 7/8lb of onions. How many lbs of vegetables did she buy?

math  addition of fractions 
MathMate,
The question requires us to add three fractions, with different denominators.
The first step is to find a common denominator which is the LCM (least common multiple) among 3,4 and 8.
Since 4 divides 8, so 4 need not be accounted for. The LCM of 3 and 8 is just the product 24, since there are no common factors between 3 and 8.
Now convert all the fractions to the common denominator of 24, i.e.
2/3 = 16/24
3/4 = 18/24
7/8 = 21/24
Add the numerators and divide by the denominator to get
(16+18+21)/24=55/24= 2 11/24 lbs. 
math 
sam,
thank you. Iget it know

math :) 
MathMate,
You're welcome. :)
The method above is correct, but the final result should be 2 7/24 lbs, since 2*24=48, and 5548=7. Sorry for the oversight. 
math 
sam,
Thanks