Students build rectangles and discover the difference between area (the squares that fill a shape) and perimeter (the fence around it) — two measures people mix up all the time.
Students will be able to…
To carpet a room you need one measurement; to put a fence around a yard you need another. What’s the difference — and how do you find each?
Project this and change the width and length. Watch the area (squares inside) and the perimeter (distance around) update, and talk about why they change differently.
Tap any phase to open the teacher moves and student actions.
Two jobs, two different measurements.
Teacher finds area and perimeter of one shape.
Class drives the Rectangle Builder.
Students build and measure rectangles.
Sort one last problem together.
Aligned to the Common Core State Standards for Mathematics, including the Standards for Mathematical Practice.
Relate area to the operations of multiplication and addition; find areas of rectangles.
Solve real-world problems involving perimeters of polygons, including finding an unknown side length.
Apply the area and perimeter formulas for rectangles in real-world and mathematical problems.
Look for and make use of structure in rows and columns of unit squares.
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students draw a room on grid paper and calculate the area (for carpet) and the perimeter (for baseboard trim). A printable grid floor-plan is in the Math library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.