Adding Positive and Negative Numbers Using a Number Line

This video tutorial teaches how to add positive and negative numbers using a number line. It begins with an introduction to the concept, followed by three examples demonstrating the process. The first example shows how to add -5/10 and 1 5/10, resulting in 1. The second example involves adding -2.1 and 4.2, highlighting the commutative property. The third example adds 1.5 and -0.5, again using the commutative property. Throughout the lesson, the number line is used to visualize the addition process, emphasizing the importance of starting at zero and moving left or right based on the numbers' signs.

What is the result of adding -2 1/10 and 4 2/10, and how do you arrive at that answer?

How does the number line help in understanding the addition of positive and negative numbers?