Scale and similar shapes

MathematicsRatio & ProportionAges 10–11

Solve problems involving similar shapes where the scale factor is known or can be found

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If your child has a scale drawing where 1 cm represents 5 m, and a room measures 3.5 cm on the plan, can they work out the real length of the room?

Solve problems involving similar shapes where the scale factor is known or can be found

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5 before · 3 after

Before

This concept

Scale and similar shapesProcedural concept

Find the missing side of a similar rectangle given a scale factor of 3
Determine the scale factor between two similar triangles from given side lengths
Use a scale factor to enlarge or reduce a shape and verify that all sides are in the same ratio

“If your child has a scale drawing where 1 cm represents 5 m, and a room measures 3.5 cm on the plan, can they work out the real length of the room?”