To determine how many 1x6x16 ft T&G boards you need to cover 801 square feet, first calculate the area covered by one board. A 1x6 board is approximately 0.5 ft wide and 16 ft long, so it covers about 8 square feet (0.5 ft x 16 ft). Dividing 801 square feet by 8 square feet per board gives you approximately 100.125 boards. Therefore, you would need 101 boards to cover the area, accounting for any waste or cuts.