This educational book, authored by Sergei Zelenko, focuses on fundamental arithmetic skills with a special emphasis on addition and subtraction. It comprises 1000 various examples and mathematical puzzles designed to enhance the problem-solving abilities of young learners and make mathematics enjoyable. The book employs engaging illustrations and practical exercises that enable students to practice concepts in an interactive manner. Ideal for both classroom use and independent study, it serves as a valuable resource for teachers, parents, and students alike, fostering a solid foundation in basic mathematics.