An end-of-lesson recap on perimeter for Year 3 maths. Pupils explain perimeter in their own words, calculate perimeters from a grid rectangle and a labelled triangle, design their own shape with a perimeter of exactly 14 cm, then tick which activity they felt most confident about. Answer key included. Matches the England National Curriculum objective on measuring the perimeter of simple 2-D shapes.
Measurement
“Measure the perimeter of simple 2-D shapes”
Calculation, explanation and the 14 cm design task all centre on perimeter.
Measurement
“Measure, compare, add and subtract: lengths (m/cm/mm); mass (kg/g); volume/capacity (l/ml)”
Adding side lengths in cm practises length addition.
An own-words explanation, a multiple choice question on a grid rectangle, and a perimeter calculation.
Add the side lengths of a triangle, then sketch a shape with a perimeter of exactly 14 cm.
A confidence tick-box and a top tip for measuring perimeters accurately.
Answers and example responses for the open questions.
Lesson plenary
The recap format is built for the last ten minutes of a perimeter lesson.
Assessment check
The design task shows who can work backwards from a target perimeter.
Revision
Reuse before an assessment as a quick perimeter refresher.
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