Not so with DD9. If she was capable of doing harder math, she'd be getting A+++s with garlands on her tests instead of mere As, and she would understand that "The sum of m and 9" is m + 9 and not 9 + m and that writing a sentence explaining how you did each step in a long subtraction problem is a really good idea. In fact, her resistance to "correcting" "wrong" answers like 0.25 = 1/4 is evidence of her lack of understanding (1/4 = 1/4).
Holy smokes! That teacher would be triggering my throttling instinct. Your composure is commendable.
