The length of the block = 1ft.
The volume of the length of the side of blocks = 1ft^3
The 3 on the one feet means raised to power 3.
So, 1ft raised to power 3:
To get the length, we would assume the block is a cube
The volume of a cube = length^3
1 ft^3 = length^3
Hence, the length of the block = 1ft.