In this lesson, the topic of number systems, specifically binary and its representation, is explained as part of the fourth-year secondary school curriculum. The focus is on understanding how to operate with binary numbers, including addition, subtraction, multiplication, and division within a register. The lesson also covers the concept of two’s complement and how to find the range of representable numbers in this system, using a specific formula for calculations. Students learn to apply this knowledge through examples, ensuring a clear grasp of binary operations and number representation.