lesson
Think in layers and containers
1 · Learn
Volume measures occupied three-dimensional space. Unit cubes can build a model of volume. A block with two layers of six unit cubes contains twelve unit cubes.
Capacity is how much a container can hold. A large-looking tall container may hold less than a wider one, so estimate then measure carefully with safe equipment rather than judging height alone.
2 · Worked example
A cuboid three cubes long, two wide and two high has twelve cubes. I count the hidden layer too, not only the visible top.
3 · Your turn
A model has four layers with six unit cubes in each. How many cubes does it contain?
Check your answer
24 unit cubes.
4 · Apply your learning
Build two different shapes with the same number of safe cubes. With an adult, compare small containers using cold water and a measuring jug, keeping water away from devices.
Adult guidance and safety
Model the calculation or measurement before relying on a procedure. Explain estimates, units and checks. Use a ruler/protractor and suitable diagrams where needed; text examples alone do not establish practical skill or fluency.
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Check a calculation · Year 5 onward
Use this only when your teacher or adult allows a calculator for the task. Show your thinking first. It does not replace mental or written arithmetic and does not mark your lesson answer.
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