Activity 01
Pairs Challenge: Twin Area Shapes
Provide pairs with multilink cubes or squares. Challenge them to build two different rectilinear shapes each with an area of 12 square units. Pairs count squares to confirm area, measure perimeters with rulers, then swap shapes with another pair to verify. Conclude with a class share-out of findings.
Justify why area is measured in square units.
Facilitation TipDuring the Pairs Challenge, circulate and ask each pair to explain how they counted partial squares before recording their area.
What to look forProvide students with a grid paper drawing of a rectilinear shape. Ask them to count the squares and write the area. Then, ask them to draw a different rectilinear shape on the same grid that has the same area but a different perimeter.
UnderstandApplyAnalyzeCreateRelationship SkillsSocial Awareness
Generate Complete Lesson→· · ·
Activity 02
Small Groups: Area Station Rotation
Set up three stations: one for counting areas of pre-drawn shapes on grids, one for building shapes to match given areas, and one for perimeter comparisons of same-area shapes. Groups rotate every 10 minutes, recording justifications in notebooks. Debrief as a class on patterns observed.
Construct two different rectilinear shapes that both have an area of 12 square units.
Facilitation TipFor the Area Station Rotation, provide grid overlays so groups can physically move and verify their counts for partial squares.
What to look forPresent two different rectilinear shapes on a grid that both have an area of 10 square units. Ask students: 'How do you know both shapes have the same area? How are their perimeters different? Why does changing the shape change the perimeter but not the area?'
UnderstandApplyAnalyzeCreateRelationship SkillsSocial Awareness
Generate Complete Lesson→· · ·
Activity 03
Whole Class: Prediction Demo
Display a rectilinear shape on the board or interactive whiteboard. Ask the class to predict area by counting squares aloud together. Rearrange the shape live, recount area, and measure new perimeters. Students vote on predictions before reveals to build engagement.
Analyze how changing the arrangement of squares affects the perimeter but not the area.
Facilitation TipIn the Prediction Demo, pause after rearranging shapes to ask students to predict what will happen to the area and perimeter before revealing the answer.
What to look forGive each student a card with a 4x3 grid. Ask them to shade in squares to create a rectilinear shape with an area of 8 square units. On the back, ask them to write one sentence explaining why we use square units to measure area.
UnderstandApplyAnalyzeCreateRelationship SkillsSocial Awareness
Generate Complete Lesson→· · ·
Activity 04
Individual: Grid Puzzle Sheets
Hand out grid paper with irregular rectilinear outlines. Students count squares individually, including halves and quarters, to find areas. They then draw their own shape matching a target area like 20 units. Collect and display for peer review next lesson.
Justify why area is measured in square units.
What to look forProvide students with a grid paper drawing of a rectilinear shape. Ask them to count the squares and write the area. Then, ask them to draw a different rectilinear shape on the same grid that has the same area but a different perimeter.
UnderstandApplyAnalyzeCreateRelationship SkillsSocial Awareness
Generate Complete Lesson→A few notes on teaching this unit
Teach this topic by letting students discover the concept first through guided exploration. Avoid starting with the formula, as counting squares builds the foundation for understanding why area equals length times width. Encourage students to verbalize their counting strategies, as explaining partial squares deepens their comprehension. Research shows that concrete experiences with unit squares reduce misconceptions about area and perimeter.
Students will confidently count whole and partial squares, explain why area uses square units, and recognize that rearranging shapes does not change their area. They will also compare perimeters and areas, using precise language to describe their reasoning.
Watch Out for These Misconceptions
During the Pairs Challenge, watch for students who label their area with linear units like centimetres instead of square units.
Prompt pairs to hold up their unit squares and ask, 'How many of these 1x1 squares cover your shape?' Have them write the area as 'square units' to reinforce the concept.
During the Area Station Rotation, watch for students who skip counting partial squares or assume they do not contribute to the area.
Circulate to groups and ask, 'How will you count the half squares along the edge?' Encourage them to use the grid overlay to physically combine partial squares into wholes.
During the Prediction Demo, watch for students who believe rearranging a shape changes its area.
Have students cut out their original shape and rearrange it on the grid. Ask, 'Did the number of squares change?' Use this to lead a discussion on conservation of area.
Methods used in this brief