4×4= 16—— The side length is 4 decimeters, and the square floor tile area is calculated according to the formula of square area = side length × side length.
80 square meters =8000 square decimeters-because the units are different, it cannot be directly divided. You can convert the area of sidewalks into square decimeters or square tiles into square meters.
8000 ÷ 16 = 500-total area of 8000 square decimeter, floor tile area16 square decimeter. Calculate the number of blocks with the formula of total area/floor tile area = number of blocks.
You need 500× 3 = 1500-500 yuan, one piece needs 3 yuan, and the money is calculated by multiplication.
Answer: We need 500 such tiles. If each tile is 3 yuan, it will take 1.500 yuan to complete the pavement.