A storage box is a cuboid measuring 10 centimetres by 4 centimetres by 2.5 centimetres. Enter the number of cubic centimetres in its volume.

الشرح

Multiplying 10 by 4 gives a base holding 40 unit cubes, and 2.5 layers of that base fill the box. Rounding the 2.5 to a whole number before multiplying changes the box being measured and shifts the result by a full twenty either way.