The lesson is devoted to an exciting topic -- numerical puzzles. Problems of this type are a valuable resource since they possess both an entertaining and an educational value. Students enjoy numerical puzzles because they treat them as brain-teasers and riddles. Teachers also appreciate these problems for several reasons. They help the students develop critical thinking and logical skills, as well as deepen children's understanding of the nature of numbers and of arithmetic operations.
Moreover, these puzzles carry an additional appeal to the students: with some persistence, every student is usually able to find the solution. The path to the solution will be defined by the individual balance of trial-and-error and logical analysis.
The intentional audience for this lesson are students of grades 4-6.