This math card game is essentially Blackjack without face cards or tens. We have five attempts to reach a total of 25 without going over. I removed the face cards and tens so my children would have to do a little more addition throughout the game. Aces are worth one. I'm a fan of games like this, because it forces my daughter (who really doesn't like math, but who loves games) to work on her math facts without even realizing it!