4'x8' full piece of plywood if you cut this into 4 equal pieces what would the final measurement or the pieces of wood be?

Well, darling, if you slice that 4'x8' plywood into 4 equal pieces, you'll end up with pieces that are 2'x4' each. Simple math, honey, nothing fancy about it. Just make sure you measure twice and cut once, unless you want uneven pieces and a whole lot of regret.