A wrap-up sheet on perimeter of rectilinear shapes for Year 4 maths, heavier on reasoning than on sums. Pupils explain perimeter to an alien who has never studied Earth maths, describe how to find the unlabelled sides of an L-shape, and work like detectives on a rectangular playground with a 30-metre perimeter and one 10-metre side. A reflection page follows, and model answers with teacher notes are included. Linked to the England National Curriculum perimeter objective.
Measurement
“Measure and calculate the perimeter of a rectilinear figure (including squares) in centimetres and metres”
The questions probe whether pupils understand the method, not just whether they can add sides.
Three reasoning tasks: the alien explanation, the L-shape with missing measurements, and the playground detective problem.
Reflection prompts, including which part worked the brain hardest and a sentence starter to complete.
Model answers and teacher notes for every prompt.
Plenary
Close the perimeter lesson with the alien explanation as a talk task.
Assessment check
The playground problem separates method-followers from problem-solvers.
Talk partners
All three Quick Check questions suit paired discussion before writing.
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