How do I help 9F appreciate math?

First off this is my step-daughter. I don't want anyone to think I am ragging on her, she is an awesome kid and I love her. Her dad works long hours, so I am often the one helping with homework when she is with us (half-time).She does her math homework on her own, and then I check it and help her make corrections. She gets easily frustrated about her wrong answers and would prefer I not look over her homework at all. She gets full credit for her homework if all of the answers are filled in, even if they are all wrong, so it "doesn't matter" if she does them right. She usually gets the majority of the problems wrong, and then we work through the corrections together.The problem is that she just brought home a big math test with 55% score. This was covering comparing fractions and decimals. While she's not happy about the grade, she again says it doesn't matter because they are just going to move on to a different math concept and maybe she will do better with that one. She hasn't quite grasped yet that math skills will layer and build from now (4th grade) through college.It seems like it general she does not care about getting good grades, and this is especially affecting her math. Now when I was a kid I cared about my grades an unhealthy amount because I would get in big trouble with my parents if I didn't get good grades (spankings, losing privileges, etc). I had a lot of anxiety in school about missing assignments or not getting As and Bs because of this. I certainly don't want that to be the situation in our family now, but I also don't think its okay for a kid to just shrug their shoulders about an F and say "whatever it doesn't matter" and go off to play with her sister. She is kind of like the opposite of me and my schoolwork anxiety, it does not seem to trouble her at all. Where is the happy middle-ground?I would like to help her improve her math skills, but also to appreciate the necessity for doing well in math now, and maybe (long shot?) help her enjoy math a little more. I don't really know how to help her see that her grades do matter without going down the route of punishing poor grades. via /r/Parenting http://ift.tt/2q3sUEq