Hi, Im John and I am a year 4 teacher, so therefore I am teaching children in Piaget’s level that you have just described. I think the best thing to do with children at this age level is to provide them with as many concrete activities that you can which each present opportunities to master their mental processes. These can be activities for example, "involving ordering, classifying, reversing and multiplying" (Snowman, et al., 2009, p.39). I have included a picture on some of my children practicing these mental processes. (image 4).