What I do to help the kids memorize Math facts
is make it into a game,
i write the facts
(1x2, 2x1, you can do this with subtraction or addition also, etc)
on recipe cards
(i only do 0-3 at first and then add more facts as they need, and take out the easiest ones)
and play a game called concentration.
Its where you take turns turning over the cards to find matches, it works so good!
You can start where the child is, like the older kids i start at 3s or 4s since most of them know the other facts.
Be sure to write the facts 4x2 and 2x4 also 1x8 would be a match. I stack them when i write them out instead of side by side but either way works!
You can play this game with all the kids no matter what age really, even younger ones ( just to be include they learn something)