Reference. Corner of Mathematics. All Mathematics 1-4 in Concepts, Rules, and Examples

"Corner of Mathematics" is a textbook. It presents the entire mathematics curriculum studied in elementary school. All concepts are systematized and clearly presented.
The textbook can be used in the classroom corner as a visual aid, as well as a visual aid for studying and reinforcing material during individual work at school and at home, and while preparing for the final certification at the end of elementary school.