It’s actually better at math than it is at arithmetic, and I think this discussion has been about arithmetic. I could make up something about how math is more like language than arithmetic is. I suspect the hypothesis that math tests tend to have a lot of stereotypical problem structures from a shared curriculum is also relevant. But who knows at this point?

Anyway, to convince me it’s good at arithmetic is not complicated…just be good at arithmetic! That is do it correctly, every time, for any size number.