If Alice wishes to get her bedroom ceiling of dimensions 16 ft ×10 ft painted, then the area which needs to be painted is _____ ft².

The area of the ceiling can be calculated by dividing it into small unit squares, each of 1 ft side and 1 ft² area as:

It is clear that the ceiling is composed of 160 squares.

∴ Area of the ceiling = area of 160 squares

= 160 × 1 ft²

= 160 ft²

Therefore, the area which needs to be painted is 160 ft².