Intermediate
40 mins
Teacher/Student led
+80 XP
Teacher-led from the board. Pupils do not need a device, but can follow on one.
What you need:
3D solids
Play dough

The Flat Faces Hiding on Solids

In this lesson you will explore how different solid shapes leave behind flat footprints when pressed into paint or dough. Match cubes, cylinders and cuboids to their prints and discover why a sphere leaves none at all.

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    Manipulative task

    1 - Getting Started ~3 mins

    Illustration for Getting StartedDetectives! Three solids from the maths shelf were pressed in paint and left these footprints. What shape is each one? Which solid do you think made it?

    2 - Watch and Notice ~8 mins

    A face is a flat side of a solid. When we press that flat side in paint, it leaves a footprint.

    Watch each solid. Before it lands, say which footprint you think it will leave. One solid has no flat face at all. Can you spot it?

    3 - Try It Together ~10 mins

    Now you are the detectives. At your table, press a solid into the dough, lift it and look at its footprint. Then turn the solid and press a different side. Is the footprint the same, or different?

    Three pictures in a row. 1 Press: a dice above a lump of pink play dough, with an arrow pointing down. 2 Lift: the dice lifted up, with an arrow pointing up, and a square pressed into the dough. 3 Look: the square footprint in the dough under a magnifying glass.

    Press and peek

    4 - Draw the Cube's Footprint ~3 mins

    COPYBOOK MOMENT

    In your maths copy, draw the footprint a cube would print. Write the word footprint under it.

    Pupil practice
    Module 6 · Shape and Space: 2D, 3D, Position and Turns Shape & Space
    Lesson 67 · The Flat Faces Hiding on Solids
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