Michael's father brought him a 16-foot board to cut into shelves for his bedroom. Michael plans to cut the board into 11 equal size lengths for his shelves.

Ten cuts produce eleven pieces. The two end pieces will only be affected on one end while the interior pieces will be affected on both ends.
Without the effect of the blade, the pieces would all be:
16/11 ft = 1.455 ft.
The two end pieces will be reduced by half of the blade width (remember: each cut is shared between the two pieces that result; hence the factor of 1/2):
1.455 ft - 0.063 ft = 1.392 ft.
The remaining pieces will be reduced by one blade width, a half width on either side:
1.455 ft - 0.125 ft = 1.330 ft
Thus, two shelves will be 0.062 ft shorter the the remaining nine. 0.062 ft = 0.744 inches. Perhaps the carpenter can make adjustments for this if he knows a little more algebra! :-)
QED

Thank you for helping me