You can learn the basics of mathematics even before you go to school, for this it is enough to play, including the game Math Games for kids. She will not give a full course of study, but you will learn something, while not particularly straining. First, solve a few examples of addition and subtraction. As answers, you must transfer the required number of chickens to the meadow and press the yellow button under the example. When the answer is correct, a green checkmark will appear and you will understand that this is the correct solution. Don't worry, there will be enough chickens for any answer, just carry them over and they will reappear in Math Games for kids.