Number Snakes is a game that develops strategies dealing with place value, numeration, seriation and proportionality. Students choose two cards to make a double digit number, name it, and then decide on which "band" of a snake it should go. However, as more bands of the snakes are filled in, the game becomes more difficult, as careful attention must be paid to how far apart each number should be.
There are 7 different levels of the game, from filling in 3 spaces, to filling in 8 spaces, as well as a "do it yourself" sheet. This is an excellent activity to send home for practice, as there is an instruction sheet for parents with suggestions on strategies and variations. There is also a reproduceable sheet of "number cards" which can be photocopied and cut out for use in the game.