I muddled through long division and all the other crap I already knew in middle school while I was devouring all the Martin Gardiner collections and the Time Life series on mathematics. My parents dropped me at the library once a week and had some idea what I was doing — certainly they appreciated good grades, but there was not handwringing over support from the school.
What one typically finds is that kids good at X, are interested in X. You can't force them to be interested, but you can offer opportunities to see if they are.
Some kids just won't find math interesting, and likely will just barely pass the requirements in school. And you as a parent can't change that.
And to be honest, it's not the end of the world. I know plenty of successful people who are terrible at math.
I muddled through long division and all the other crap I already knew in middle school while I was devouring all the Martin Gardiner collections and the Time Life series on mathematics. My parents dropped me at the library once a week and had some idea what I was doing — certainly they appreciated good grades, but there was not handwringing over support from the school.