TheSameAs

Teaching rounding up or down by 10, 100 or 1000? This game I played with my class went down a storm today!
Give each child three random digit cards each, then write a multiple of 100 on the board. The children arrange the number nearest to that on the board. The children win one counter if their number rounds up or down to the target number, and two if theirs is the nearest to the target. Plat two more rounds before swapping their cards.
To add a twist to the game, why not allow the children to 'buy' someone elses card for a counter?