Once upon a time in Mr. Whatâ€s-His-Nameâ€s class, you were the undisputed math whiz of the sixth grade. Nowadays, youâ€re lucky if you can calculate a 20% tip without whipping out your phone to use the tip calculator app. Unfortunately, that means helping your kids with their math homework is absolutely out of the question. Good thing thereâ€s 24 Game. These handy and fun card sets teach kids about math, have a self-check feature and offer three difficulty levels. And thereâ€s no shame in using them yourself to brush up on those long-forgotten math principles. Go on. Do your sixth-grade, math-genius self proud.