Negative numbers introduction | Negative numbers and absolute value | Pre-Algebra | Khan Academy

Understand: Negative Numbers - An Overview

Understand and Learn the Rules of Positive and Negative Numbers

Quick Excel trick to convert positive numbers to negative numbers (vice versa and no formula use)

Negative numbers and number line examples | Pre-Algebra | Khan Academy

Adding negative numbers (example) | Negative numbers and absolute value | Pre-Algebra | Khan Academy

Negative Numbers: An Overview