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But when she solves the smaller parts of the question (11-7, 8-5, etc) in her head she takes an obscenely long time and is wrong at least half the time.

Forgive me if this is a stupid question, but maybe she needs to do some rote facts work? Or is the concern that somehow the basics aren't there--like, there is an inability to conceptualize 8-5?

I feel like with some kids, they just need to get the facts cemented before moving on or they will get hung up? No? Feel free to shoot me down.