The Other Side Of | Class 6 Mathematics Notes

The Other Side of Zero

This section introduces the idea of numbers less than zero using the imaginative context of Bela's Building of Fun, a multi-storied building with floors both above and below the ground floor. The ground floor is called Floor 0 or the 'Welcome Hall'. Floors above are numbered with positive integers (+1, +2, +3, etc.), and floors below are numbered with negative integers (-1, -2, -3, etc.).

A lift in the building has two buttons: '+' to go up and '–' to go down. Pressing the '+' button once is denoted as +1, pressing it twice as +2, and so on. Similarly, pressing the '–' button once is -1, twice is -2, etc. This helps visualize positive and negative numbers as movements up and down floors.

The section explains that positive numbers have a '+' sign, negative numbers have a '–' sign, and zero has neither. This real-world example helps students understand the concept of integers as numbers extending both above and below zero. It also introduces the terminology of positive numbers, negative numbers, and zero as the reference point.

📊 Diagram: Observe that some of the floors in the 'Building of Fun' are below the ground. What are the shops that you find on these floors? What is there on the ground floor?

🧪 Activity: Number all the floors in the Building of Fun using the ground floor as Floor 0 and identify the shops on each floor.

🔗 Connection: This section sets the foundation for understanding addition and subtraction of integers as movements along floors, which is explored in the next section.