Thanks for the ideas so far. She does like geometry, but I don't know much to do wrt that other than to pull out my Euclid, and I don't dare do that yet. We do lots of cooking together, but she will absolutely not answer if I ask her to do math during cooking. We've done negative numbers since DD was 2 or 3, so she knows all about those and they're no longer exciting.
I'll check out Murderous Maths.
To be clear, I'm really not worried about calculation errors or even about slow progress. That's fine, as far as I'm concerned. What worries me is the attitude that she has about it, and the fact that I don't know where it came from or how to deal with it.
