Curated OER
Magnify That
Students observe many different objects using a magnifying lens. In this magnification lesson plan, students learn that scientists use different tools, and they use the tool to magnify objects in the classroom to see objects in better...
University of Cambridge
University of Cambridge: Nrich: Christmas Shopping
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.