Mathematics
Intermediate
50 mins
Teacher/Student led
+75 XP
What you need:
IWB/Projector/Large Screen

Pentagons, Hexagons and Octagons

Learn to identify and name pentagons, hexagons and octagons by counting their straight sides carefully, even when a shape is turned a different way.

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    1 - Getting Started ~4 mins

    Illustration for Getting StartedLook at these two pictures: a red stop sign from the side of a road, and a piece of honeycomb from a beehive.

    How many straight sides can you count on the stop sign? Does every side look the same length? Now look at one cell in the honeycomb: how many straight sides does one cell have?

    2 - Watch and Notice ~8 mins

    Here are three many-sided shapes on the board. As each one is shown, its sides light up and get numbered one by one all the way around.

    Count along with the numbers. A pentagon has five sides. A hexagon has six. An octagon has eight. Watch how the last number round the shape is always its side count.

    3 - Write the Shape Names in Your Copy ~3 mins

    COPYBOOK MOMENT

    In your maths copy, write the three words one under the other:

    • pentagon
    • hexagon
    • octagon
    Beside each word, write how many sides that shape has. Read each one aloud when you finish.

    4 - Try It Together ~7 mins

    We count four shapes together on the board: one after another, ending with a shape turned onto its side.

    One pupil comes up and taps each side to number it. The rest of the class counts out loud together as the numbers appear, and when the count is done we all say the shape's name.

    5 - Class Challenge ~8 mins

    Your turn now. Count the sides on each shape. There are four shapes, and the last one is turned a different way. Count every side, even when a shape is turned.

    How many sides?

    Pupil practice
    Module 7 · 2D and 3D Shapes and Angles Data & Chance
    Lesson 74 · Pentagons, Hexagons and Octagons
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