Calc mushrooms on a glade

Soon September 1, it means that that soon they will go to school, and there are those who go there for the first time. They are called first-graders. Before the first lesson they should be prepared for all lessons. The most important lesson is math, this is the game, help the kids, pull up your knowledge of arithmetic. In each of the tasks, it is necessary to calculate at a glance in a clearing number located on it mushrooms. In each level, there are three options to choose the right one. It is not necessary to do it at random.