Step by step
The question
Question: find the volume of a box 12 long, 5 wide and 3 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 = 12, width = 5 and height = 3.
V = 12 × 5 × 3
12 times 5 is 60.
That is one layer of 60 cubes.
There are 3 layers.
So V = 60 × 3.
V = 60 × 3
60 times 3 is 180.
So the volume is 180 cubic units.
V = 180
Answer
V = 180