8
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17 2x4=8+(3x3)=17 3x3=9 9+8=17
8 it is the same as 4+4
238 = 2x4 = 2x2x2 = 23.
A "board foot" is 1 inch thick, 12 inches wide, 12 inches long. A 12 ft 2x4 would be 8 board ft- 1/3 the width, but 2X the thickness.
1x2 1x3 1x4 and so on... 2x3 2x4