New
New
Year 6
Reason about shapes using the relationship between side lengths and area and perimeter
I can reason about shapes using the relationship between side lengths and area and perimeter.
New
New
Year 6
Reason about shapes using the relationship between side lengths and area and perimeter
I can reason about shapes using the relationship between side lengths and area and perimeter.
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Lesson details
Key learning points
- Area and perimeter are calculated from the side lengths of 2D shapes.
- Area is measured in square units.
- Perimeter is measured in units of length.
Keywords
Area - Area is the measurement of a flat surface and measures 2D space.
Perimeter - The distance around a 2D shape is its perimeter.
Common misconception
Area and perimeter are easily confused. In this lesson, both concepts are explored, often at the same time.
Use your knowledge of the pupils' attainment (including using the Starter Quiz) to see which pupils are confusing the terms. All pupils will benefit from access to a working wall which gives a clear reminder of which is which.
The final two questions of the Practice section of Cycle B are open-ended and therefore have many possible answers. You may wish to allocate a set amount of time for pupils to work on each of them, encouraging them to find the most possible answers in that time.
Teacher tip
Licence
This content is © Oak National Academy Limited (2025), licensed on
Open Government Licence version 3.0
except where otherwise stated. See Oak's terms & conditions (Collection 2).Lesson video
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Starter quiz
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6 Questions
Q1.
What is the inverse of × 4?
+ 4
− 4
× 8
Q2.
Which of these are factors of 12?
5
24
60
Q3.
What is the perimeter of this shape? Remember to use the correct unit of measure.
Q4.
A square has side lengths of 75 mm. What is its perimeter? mm
Q5.
A rectangle has side lengths of 17 cm and 4 cm. Its area is cm².
Q6.
What is the area of this square? cm²
Exit quiz
Download exit quiz
6 Questions
Q1.
This square road sign has a perimeter of 120 cm. What is the length of one side? cm
Q2.
What is the missing dimension of the rectangle which has an area of 104 cm² and one known side of 8 cm? cm
Q3.
The smaller rectangle has sides of 7 cm and 3 cm. The larger rectangle is composed of two of the smaller rectangles. What is the perimeter of the larger rectangle? Remember to use the correct unit.
Q4.
The square has an area of 64 cm². It is decomposed into four congruent rectangles. What is the perimeter of one of the small rectangles? Remember to use the correct unit.
Q5.
The larger rectangle is composed of two of the smaller rectangles. What is the area of the larger rectangle? cm²
Q6.
The larger rectangle is composed of the smaller rectangles. What is the area of the larger rectangle? cm²
