Activity
University of Cambridge

University of Cambridge: Nrich: Number Juggle

For Students 3rd - 8th
Use those problem solving skills to find a solution to this triangle problem. When you have your solution you can check it right on this one page website.
Interactive
University of Cambridge

University of Cambridge: Nrich: Game Khun Phaen Escapes to Freedom

For Students Pre-K - 1st
This interactive game is based on a famous character in a Thai legend. See if you can figure out how he escaped! You will have to use your problem solving and spatial relationship skills to figure out this one.
Activity
University of Cambridge

University of Cambridge: Nrich: Butterfly Flowers

For Students K - 1st
This one page website offers a challenge that will require you to use your problem solving skills. There are teacher tips and the solution available to help.
Activity
University of Cambridge

University of Cambridge: Nrich: 1, 2, 3, 4, 5

For Students 3rd - 5th Standards
On this one page website sharpen your logic and problem solving skills while working on this challenge. The solution is available to double check your solution.
Activity
University of Cambridge

University of Cambridge: Nrich: Eleven?

For Students 3rd - 8th
Only by replacing these letters with the correct digits can you make this problem add up correctly! The solution is located right at this one page website.
Activity
University of Cambridge

University of Cambridge: Nrich: Money Bags

For Students 1st - 8th
Practice your problem solving skills while you help Ram figure out how many pennies to put in each bag. The solution is right on this one page website.
Activity
University of Cambridge

University of Cambridge: Nrich: Magic Triangle

For Students 3rd - 8th
Use your problems solving skills to make everything add up correctly for this challenge. The solution is right at this one page website.
Activity
University of Cambridge

University of Cambridge: Nrich: Magic Circles

For Students 3rd - 8th Standards
Use your problem solving skills to figure out this challenge. A number of solutions are available right at this one page website.
Activity
University of Cambridge

University of Cambridge: Nrich: A Shapey Network

For Students Pre-K - 1st
Sharpen your problem solving and logic skills on this network activity. There is a "Printable Page," link if you want to print it out to help you with your strategy.
Lesson Plan
Alabama Learning Exchange

Alex: Estimation Station

For Teachers 3rd - 5th Standards
During this lesson, students will learn the difference between estimation and guessing. Knowing how to estimate is an essential skill that will help students determine approximate totals as well as check the reasonableness of their...