What is her incentive for NOT making those kinds of errors?
Can you tie this to some kind of 'currency' for her?
My DD was pretty darned SLOPPY with her calculations up until she was about 12yo, honestly. It's not that she couldn't do the math-- and in fact, most of the time, it was more like it wasn't worth fully engaging her brain to work through it or something... I don't know-- not explaining that well, I am sure.
What happens if you give her harder math even than what she is expected to work on routinely?
Does she do BETTER on harder problems?
That would be a tip-off that she's underchallenged, IMO.
