Children develop a concrete understanding of the concept of ten with these connecting train cars, each holding 10 Unifix Cubes (or other suitable counter).By filling the spaces and connecting the cars, children can see and feel "10 and some more," 20, 30, etc.Includes ten cars, 20 Unifix Cubes, ten-frame spinner, and teacher's guide with games, teaching ideas, and assessment instructions.For individual or small group use.