I still think a 6th grader should be able to do that problem. Especially if a teacher had given them a few similar examples over the course of the year -which she should readily be able to do, as the teachers are "teaching to the tests".
I'd actually like to see a standardized test and also see the curriculum for a 6th grade class...
I have taught freshmen and sophmores at the university level and standards are definitely falling -many kids cannot do basic math or even write using correct grammar and spelling even with the help of "autocorrect".
Skeeter, I am not at all criticising your child specifically -she probably *would* be able to readily do such a problem if teaching and expectations demanded it.