To calculate the number of ceiling boards required to complete the ceiling for the room, follow these steps:
Step 1: Calculate the area of the room's ceiling.
Area of the room = Length × Width Area of the room = 3.5m × 4.5m Area of the room = 15.75 square meters
Step 2: Calculate the area covered by one ceiling board.
Ceiling board area = Length × Width Ceiling board area = 0.9m × 2.4m Ceiling board area = 2.16 square meters
Step 3: Determine the number of boards needed.
Number of boards = Total area of the ceiling ÷ Area covered by one board Number of boards = 15.75 square meters ÷ 2.16 square meters ≈ 7.29167
Since you cannot buy a fraction of a board, you'll need to round up to the nearest whole number, as you can't use a partial board for the ceiling. Therefore, you will need 8 ceiling boards to complete the ceiling for the room.
Keep in mind that this calculation assumes there won't be any wastage or cuts during installation. It's a good idea to purchase a few extra boards in case of any mishaps or errors during installation.