Adding and Subtracting Integers Using a Number Line

The Organic Chemistry Tutor

This educational video provides a clear, step-by-step tutorial on adding and subtracting integers using a number line. It begins with basic addition of positive numbers to establish the visual model, where moving right represents addition and moving left represents subtraction. The instructor systematically introduces complexity by incorporating negative numbers, demonstrating how to handle scenarios like adding a negative integer to a positive one, starting with a negative integer, and adding two negative integers together. The video addresses common stumbling blocks for students, particularly the concept of subtracting negative numbers (the "double negative" rule). Through repetitive, clear examples, the narrator demonstrates that subtracting a negative number is mathematically equivalent to adding a positive number. The visual aid of the number line is used consistently throughout every example to reinforce spatial understanding of these abstract concepts. For educators, this video serves as an excellent remedial tool or introductory lesson for Pre-Algebra students. It transforms the abstract rules of integer operations into concrete visual movements. The pacing allows for "pause-and-predict" moments where students can attempt to solve the problem on their own number lines before watching the solution, making it highly interactive for classroom use.