Learning math facts. It's something that's just got to be done. Usually the default recommendation is to drill with flash cards. Sigh. I know flash cards aren't always the worst thing and I do know kids who actually enjoy them. But, my two girls just aren't all that fond of flash cards drills. (Or maybe they just know that Mommy will come up with a cool game that's way more fun...)
So, ditch the flash cards and grab a deck of playing cards. Plus 1 Minus 1 is an easy math game that reinforces the concepts of adding 1 to a number and subtracting 1 from a number. It's simple and fun.