I have noticed at times when problems are REALLY easy for DS5, he will mess them up. It's very strange. Not sure if he is just flying through them without really looking or what. Usually he has more challenging work to do and he gets all those right most of the time. But recently they made him do the review with the rest of his class and he got 0 + 6 wrong and one other one that was so simple. I know he knows all that, but either intentionally wrote it down wrong or just didn't pay attention because of how easy it was. It's annoying only because I don't want them to give him more review thinking that he doesn't know the material when clearly that is not the issue.

Wish I had good suggestions...one I can think of that could help is going back through and double checking to make sure they are all right when he is done. He could either do it at the end or be taught to do it after each problem. Not sure what type of math he is doing but sometimes you can go back and check answers by doing them in reverse so that may help if he can get in the habit of doing that. Does your son get annoyed when he gets them wrong or does he not really care? Just curious what his reaction is as if he is annoyed he may be more motivated to doublecheck so that doesn't happen.