a pack of cards is a brilliant investment!
Shuffle well and then deal 2 cards, multiply together, 1st person to get the answer gets the pair of cards, as in snap. Winner is teh one with teh most cards at teh end. Depending on teh abilities of teh people playing you can leqave on teh picture cards. If you are playing against a child, to begin with you can play so that if answer is corrct they get the cards , if not you do. Can introduce a time element as well. The game can be adapted for addition, dealing 2, 3 or 4 cards or subtraction, introducing negative numbers. Ther are loads of interesting games on the internet.
Google combination of games, multiplication etc.
This one is great!
http://www.arcademicskillbuilders.com/g ... eteor.html
really good for building up immediate recall!