A house needs 350 floor tiles with an area of 6 square decimeters to be paved with floor tiles. If the side length is 3 decimeters, how many floor tiles do you need at least?

A house needs 350 floor tiles with an area of 6 square decimeters to be paved with floor tiles. If the side length is 3 decimeters, how many floor tiles do you need at least?

The floor area of this house is: 6 square decimeters / piece × 350 pieces = 2100 square decimeters
The area of a 3 decimeter square tile is: 3 decimeter × 3 decimeter = 9 square decimeter
This house needs to lay at least 3 decimeter square tiles: 2100 square decimeter △ 9 square decimeter / block = 233.3 pieces ≈ 234 pieces

A corridor is 36 meters long and 6 meters wide. How many floor tiles do you need to use a 3-decimeter-long square floor tile? If you use a 4-decimeter-long square floor tile instead
At least how much

36 × 6 = 216 (square meter) = 21600 (square decimeter) 3 × 3 = 9 (square decimeter)
21600 △ 9 = 2400 (pieces)
4 × 4 = 16 (square decimeter) 21600 △ 16 = 1350 (block)

To pave the floor of a classroom, if you use 60 square decimeters of floor tiles, you need 80 pieces. If you use 5 decimeters of floor tiles, how many pieces do you need

It's going to take 240 seconds