4th Grade Measurement Resources
Use this for a conversation for the perimeter and/or area of a complex polygon composed of non-overlapping rectangles. Drag the blue points to create a shape, then click one of the two buttons. Drag the sliders to move the sides.
An "Open Middle" format problem: What combination of digits and units would give you the greatest distance? What would give you the least? You must combine your number sense with an understanding of relative unit sizes as you develop a strategy.
A randomly generated (L-shaped) complex polygon starts as just two sides. Drag the sliders to make the rest. Meant to allow students to see the part/part/whole relationship between opposing sides.
Drag the point to change the dimensions of the rectangle. Then click the "Go" button to see the perimeter upwrap and the area fly out. Perimeter and area lie along the number line to allow conversations about their value. Works better for small rectangles.