Ceiling area
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16x18 what? Feet, yards, metres. You need to be more specific in the question if you want a sensible answer.
9
A 4x8 sheet of plywood covers 32 sq feet. You need to cover 16x18 which equals 288 sq feet. Divide 288 by 32 and you will need 9 pieces of plywood. However, don't forget to add for waste. Usually 10-15% unless your room is without obstructions, walls, etc. For this job, you may need at least (1) additional sheet to complete the project.