I was a private tutor for quite some time, largely specializing in math. I can tell you with complete sincerity that for most students who have any math issues

I was a private tutor for quite some time, largely specializing in math. I can tell you with complete sincerity that for most students who have any math issues, fractions were their first stumbling block, and it is typically left unaddressed and festering. Going back, addressing the issue, working toward a full unconscious mastery, then working forward again was the often painful solution.