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Notes and Guidance
Children measure the perimeter of rectilinear shapes from diagrams without grids. They will recap measurement skills and recognise that they need to use their ruler accurately in order to get the correct answer. They could consider alternative methods when dealing with rectangles e.g. l + w + l + w or (l × w) × 2
What is perimeter of a shape?
What’s the same/different about these shapes?
Do we need to measure every side?
Once we have measured each side, how do we calculate the perimeter?