So just hunker down and spend some time with flashcards. It's boring but it has to be done!
When I was a kid, we did multiplication tables in school but they never do that in school today. I guess the teacher just expects that magically they will know the math facts.
I do think it's very important though. Even if your child is a wiz at math, if they still in higher grades are counting on their fingers, it will hold them back in Algebra and beyond. ALOT of kids in my son's third grade class last year did that!