3.MD.7a: Finding Area of Rectangles

Challenge Worksheet
I can find the area of a rectangle by tiling it with unit squares.

Problem 1

A rectangle has the same area as a 6×8 rectangle. List 4 other possible dimensions and explain your thinking.

Problem 2

Design a rectangular playground with exactly 180 square meters. What dimensions would you choose and why?

Problem 3

Investigate: How does the area change when you double just the length? Just the width? Both dimensions?

Problem 4

A farmer has 100 meters of fencing. What rectangle dimensions give the maximum area? Prove your answer.

Problem 5

Compare rectangles and squares: If they have the same area, which has the smaller perimeter? Explain.

Problem 6

Create a real-world problem involving rectangular area that requires multiple steps to solve.

Problem 7

Analyze this pattern: 1×24, 2×12, 3×8, 4×6. What do you notice about the areas and perimeters?

Problem 8

Explain why area is measured in square units. How does this connect to the rectangle area formula?

Problem 9

Design a floor plan using rectangles. Calculate the total area and explain your design choices.

Problem 10

Investigate: Can two rectangles have the same area but different perimeters? Prove with examples.