Thomas Jefferson National Accelerator Facility
Jefferson Lab: Place Value Game
This interactive math game lets you create the largest number possible as the computer gives you numbers.
University of Cambridge
University of Cambridge: Nrich: Game Calculator Bingo
Sharpen your place value skills playing this interactive game, Calculator Bingo. The rules are simple but the game requires some thinking if you want to beat the computer. If you respond incorrectly the computer will allow you another turn.