A game of Countdown is  great way to start or end a lesson.

Play online (the Numbers or Letters game) at

You can download an excellent free programs for the Numbers Game from Chris Farmer’s CSF Software site.

For a low tech solution print out the Make a number puzzles with solutions from Brain Food.
For other number puzzles see the Number page on Mathematics – Games.

For a new challenge why not try Coundown with Fractions from Nrich? See also the Nrich Countdown collection.

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