In a table of board measure of various lengths in feet, width in inches, and thickness as 1 inch. Info included says for boards 1 1/4 in. thick, add 1/4 to amt. in table and do same for any other board thickness.
With greater widths, use the sum of quantities in two columns, the sum of the widths that equal desired width.
Determine board feet in a plank 24 feet in length, 16 in. wide, and 2.5 in. thick.
24 ft. * 6 in. = 12 ft. board measure (from table).
24 ft. * 10 in. = 20 ft. b. m. (from table).
24 ft. * 16 in. * 1 in. = 32 ft. b. m. ( I understand this).
24 ft. * 16 * 2.5 = 80 ft. b. m. I don't understand how the 80 was calculated.