At the summer cottage, it is necessary to lay out a rectangular area with dimensions of 20m * 10m

At the summer cottage, it is necessary to lay out a rectangular area with dimensions of 20m * 10m in front of the house with 20 cm * 20 cm tiles. How many tiles do you need for this?

First, you need to convert centimeters to meters:
20cm = 0.2 (m)
Secondly, you need to find the area of one tile:
0.2 * 0.2 = 0.04 (m in sq.)
Thirdly, you need to know the area of the site:
20 * 10 = 200 (sq. M.)
And then, by dividing the area of the site by the area of one tile, we calculate how many tiles are needed:
200: 0.04 = 5000 (tiles)
Answer: 5000 (tiles)