M3.6.7 For the adult
Volume of cuboids
How much water fits in this tank?
What this chapter teaches
Volume is the space inside a solid, counted in unit cubes. A box fills in layers: length × width cubes in each layer, and the height says how many layers. One cubic centimetre holds one millilitre, and one litre is 1 000 cubic centimetres.
Three questions to ask
There is no one right wording. Listen for the idea.
- How would you find how many 1 cm cubes fill a box 5 cm long, 3 cm wide and 2 cm high?
- Why is the answer in cm³ and not in cm or cm²?
- A tank holds 20 000 cm³ of water. How many litres is that?
After the chapter, the learner can
- Count cubes to find the volume of a box
- Find the volume of a cuboid as length × width × height
- Change between cm³, ml and litres
What they copy into their notebook
Volume = length × width × height, in cm³. 1 cm³ = 1 ml. 1 litre = 1 000 cm³ = 1 000 ml. A cube of 10 cm holds 1 litre.