how many one-inch square tiles will he need to cover a surface that is 2ft by 3ft

Convert the feet to inches.

The surface measures 24 feet by 36 feet.

24in x 36in = 864 1 inch tiles

To determine the number of one-inch square tiles needed to cover a surface, follow these steps:

1. Calculate the total area of the surface. In this case, the surface is 2 feet by 3 feet.
Area = length × width
Area = 2 ft × 3 ft
Area = 6 square feet

2. Convert the area from square feet to square inches. Since each tile is one square inch, we need the measurements to be consistent.
1 square foot = 12 inches × 12 inches
1 square foot = 144 square inches
Area (in square inches) = Area (in square feet) × 144
Area (in square inches) = 6 ft² × 144
Area (in square inches) = 864 square inches

3. Divide the total area in square inches by the area covered by each tile (1 square inch) to get the number of tiles required.
Number of tiles = Area (in square inches) ÷ Area covered by each tile (in square inches)
Number of tiles = 864 square inches ÷ 1 square inch
Number of tiles = 864 tiles

Therefore, you will need 864 one-inch square tiles to cover a surface that is 2 feet by 3 feet.