To find out how many tiles Mr. Conner needs, we'll calculate the total area of the patio in square feet, then divide by the area of each tile (1 square foot).
The area \( A \) of the patio is given by:
\[ A = \text{length} \times \text{width} \]
\[ A = 18 \times 12 \]
\[ A = 216 \text{ square feet} \]
Since each tile covers 1 square foot, Mr. Conner needs \( 216 \) tiles to cover his patio.