Step by step
The question
Question: find the volume of a box 5 m long, 2 m wide and 3 m high.
1 Length × width × height
Volume is how much space is inside.
We count the 1 by 1 by 1 cubes that fit.
The volume of a box is V = length × width × height.
V = length × width × height
Now put the numbers in: length = 5, width = 2 and height = 3.
V = 5 × 2 × 3
5 times 2 is 10.
That is one layer of 10 cubes.
There are 3 layers.
So V = 10 × 3.
V = 10 × 3
10 times 3 is 30.
We count cubes, so the unit is m³.
So the volume is 30 m³.
V = 30 m3
Answer
V = 30 m3