Sandy is working with a carpenter to frame a house. they are using 8-foot-long boards, but each board must be cut to be 7 feet, 10 3/4 inches long. how much is cut off each board?

Subtract the difference between the total length of the board (8 feet) and 7 feet 10 3/4 inches. To make it easier, convert both measurements to inches.

1 foot= 12 inches

TOTAL LENGTH:
multiply total length by number of inches in 1 foot.
8 feet * 12 inches= 96 inches

LENGTH TO BE CUT:
7 feet * 12 inches=84 inches
84 + 10 3/4 inches= 94 3/4= 94.75

FIND DIFFERENCE:
=96 - 94.75
=1.25 inches
=1 1/4 inch

ANSWER:
1 1/4 inch is cut off each board.

Hope this helps! :)