University of Cambridge
University of Cambridge: Nrich: Ten Green Bottles
Sharpen your problem solving skills and find the solution to the challenge on this one page website. You might want to make a list. Once you have your solution you can check the website and see if it agrees with their solution.
PBS
Pbs Kids Afterschool Adventure!: Operation: Adding Up, Taking Away Activity Plan
In this week's Afterschool Adventure, children will practice and explore strategies for solving addition and subtraction problems, such as using counters and rulers, performing mental math, and drawing pictures. As children encounter...