AoPS did a lot to cure this problem for my DD12. She took Algebra A, and the combination of losing points for typing in the answer wrong the first time or two, but still having some points available no matter how many times she did it wrong before she got it, was motivating for her to start checking her work but not giving up on the class entirely. I think there were a couple of weeks where I sat with her while she was doing the homework and cued her to recheck if I saw her make a mistake, but I didn't have to do it for long at all. Obviously this is a YMMV thing, but that's what worked for us.

ETA: Looking back, I think there were two stages, each lasting for a couple of weeks, that I used that helped DD get over this. The first was sitting with her and telling her to recheck as soon as she made a mistake. Then there was a stage where I would look at her answer with her and tell her whether it was OK to submit or she should go over all of her work again.

Last edited by ElizabethN; 01/26/17 10:19 PM.