Starter quiz
Which expressions could be used to work out the perimeter of the shape?- 4 + 2
- 4 + 2 + 4 + 2 ✓
- 4 + 4 + 2 + 2 ✓
- 4 + 2 + 4 + 2 + 4
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What is the perimeter of this shape? ______ units.- '16' ✓
- Which of these expressions means the same as doubling 10?
- 10 + 10 ✓
- 10 + 10 + 10
- 10 − 5
- 10 + 2
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- Complete: Double 16 is equal to ______
- '32' ✓
- Which of these statements is true of a rectangle?
- It has four sides. ✓
- All four sides are different lengths.
- Opposite sides are the same length. ✓
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Complete this column addition.- '228' ✓
Exit quiz
Which calculations will give the perimeter of this rectangle?- 10 + 5
- 10 + 5, then double the answer. ✓
- Double 10 + double 5 ✓
- It is impossible to give the perimeter because there are missing side lengths.
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What is the perimeter of this rectangle?- 9 units
- 13 units
- 14 units
- 18 units ✓
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What is the perimeter of this rectangle? ______ units.- '18' ✓
Order these rectangles from shortest to longest perimeters.- 1⇔Rectangle c with sides 3 cm and 5 cm
- 2⇔Rectangle a with sides 2 cm and 7 cm
- 3⇔Rectangle b with sides 4 cm and 6 cm
What is the perimeter of this rectangle? ______ units.- '200' ✓
What is the perimeter of this rectangle? ______ units.- '84' ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- To calculate the perimeter of a rectangle you can double the lengths of the shorter and longer sides and add the values.
- To calculate the perimeter of a rectangle you can add one long and one short side and double the total.
- Mental and written methods can be used to calculate the perimeter of a 2D shape.
Common misconception
Pupils may not realise that, even when one of the long side and short side lengths is missing in a rectangle, they still have enough information as these are the same as the given lengths.
Counters are encouraged in this unit. It may be that some pupils still need the missing side lengths written on counters, but as with all scaffolding, this should only be temporary. Ask them - do you need this counter? Do you already know the number?
Keywords
Perimeter - The distance around a two-dimensional shape.
Double - Have two of something.
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