15,000 Examples in Mathematics. Counting within 20. 1st Grade

The guide includes mathematical examples on basic topics of elementary school "Counting within 10", "Counting within 20" and all algorithms of calculations. Each subtopic begins with a detailed explanation of how the operation is performed and contains various tasks that allow for a deeper understanding of the material. The student not only solves the example but also finds mistakes in the examples, inserts missing numbers, solves examples in a timed manner, chains of examples, equations, performs calculations according to diagrams. For elementary school.