The ceiling of a room measuring 6m by 8m is pasted over with square tiles with a side of 4dm. How many tiles do you need?

Let’s calculate the ceiling area of the room:
6 * 8 = 48 m² – room ceiling area.
Let us express the dimensions of the ceiling tiles in meters:
1 m = 10 dm;
4 dm = 4: 10 = 0.4 m – the dimensions of the tiles for the ceiling in meters.
Let’s calculate the area of the tiles for the ceiling:
0.4² = 0.4 * 0.4 = 0.16 m² – the area of the ceiling tiles.
Let’s calculate the number of ceiling tiles for pasting the ceiling of this room:
48: 0.16 = 300 tiles – required for pasting the ceiling of this room.
Answer: 300 tiles are required to cover the ceiling of this room.