Set the table saw fence so the blade is centered on the seam, then push the whole thing through the saw. If the board edges are quite bowed or curvy, you may need a second pass. If so, unscrew the cleats, reclamp the boards across the middle center, then screw on the cleats again. The screws ding up the ends of the boards a little, so cut the boards you’re jointing a bit long, then trim 1/2 in. from each end to remove the screw holes.
When cutting full sheets with my circular saw, I use plastic shelving units as sawhorses. The height is just right and by using three of them, I can make cuts in any direction and the plywood is fully supported. And because the shelving units are made of plastic, I can cut right into them without worrying that they’ll damage my saw blade. Plastic shelves are available for $20 at home centers. — John Tinger. Check out these tips for making long cuts with a circular saw.