In this instructional task, students decompose a figure into rectangles and then find the total area by adding the area of all of its non smaller, non-overlapping rectangles. Students must also create expressions to represent the area of the entire figure as the sum of the areas of the rectangles.

In this lesson students find the area of a rectangle by tiling it with unit squares. 

This short video and interactive assessment activity is designed to teach third graders about given the perimeter, find the side length and area - squares.

Students apply their knowledge of scale and geometry to design wearables that would help people in their daily lives, perhaps for medical reasons or convenience. Like engineers, student teams follow the steps of the design process, to research the wearable technology field (watching online videos and conducting online research), brainstorm a need that supports some aspect of human life, imagine their own unique designs, and then sketch prototypes (using Paint®). They compare the drawn prototype size to its intended real-life, manufactured size, determining estimated length and width dimensions, determining the scale factor, and the resulting difference in areas. After considering real-world safety concerns relevant to wearables (news article) and getting preliminary user feedback (peer critique), they adjust their drawn designs for improvement. To conclude, they recap their work in short class presentations.

Students will have to solve the real world problem of locker smell leakage by building an air filter that will cover the vents on the top of a locker. This project goes well with a curriculum on the particle nature of gases and phase changes.