Students in this stage also will practice how to classifying objects and ideas on complex level. W.Santrock explains, the workbooks and assignments are not use in school that practice the Piaget's theory. In Mathematic class, the students will play interesting games like counting the day's lunch money or chocolates. They will learn how to divide or multiple the numbers.According to Piaget, children should learn naturally and not stress them too much in their development. Learn and play naturally is important in children development and important way to learn about world around them. The children will progress through 4 stages which are sensorimotor stage, preoperational stage, concrete stage and formal operational stage. Children also learn through assimilation and accommodation. Many educators use Piaget's theory in their teaching and curriculums in order to create learn through experience and hands on learning. There are many practical applications that we can use and made from Piaget's theory. This theory not only focuses on how children acquire knowledge but how we understand the nature of intelligence.