This is the state in which they begin to construct their experiences. Their cognitive abilities increase along with short-term memory (Cherry) and they begin to remember information for a longer period of time. Their reasoning becomes focused and logical. The speed at which they process information is faster and it becomes easier for them to concentrate. Even at such a young age, they are able to think about problems from different points of view and understand the differences. For example, a child will learn that a substance does not change even though its physical appearance may be altered. After the age of 12 up to the age of 18 there is the adolescence phase. During this phase, cognitive learning becomes a faster process; this allows you to gain a deeper sense of knowledge. Mathematical concepts are now easier to understand and their greater knowledge allows us to understand possibilities, where previously this was a difficult task. This is especially observed in the classroom because teachers are able to visualize and understand each student's increased memory and processing speed