Abstract: A screed for forming the surface of a freshly poured concrete slab has parallel blades which are slidable relative to each other enabling extension and contraction of the screed during operation. The concrete surface is formed by pivoting movement of the screed around fixed pivot structure which supports and anchors one end of the screed. Vibrating mechanism may be included to tamp the concrete concurrently with the surface forming operation. The apparatus may be operated by a single person if necessary and the operator may extend and contract the screed during the pivoting movement in order to follow the outline of the concrete slab and/or to avoid interference from obstructions in the vicinity of the slab.