Four pieces of wood, each 11 3/8 inches long, are building a frame. if all four pieces are cut from one board, how long should the board be, to the nearest whole inch?

You need to either multiply 3 by 11 3/8 or add 11 3/8 to 11 3/8 and to 11 3/8.

Let's do the addition.

11 3/8 + 11 3/8 + 11 3/8 =

= 11 + 11 + 11 + 3/8 + 3/8 + 3/8

= 33 + 9/8

= 33 + 1 + 1/8

= 34 1/8

He needs a 35-inch board.

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18