This document describes a lesson plan taught by Sreelekshmi TS to 8th standard students about adding negative numbers. The lesson included reviewing the concept of a number line and negative numbers, having students participate in group activities that involved subtracting different colored balls to learn about negative number addition, assigning practice problems, and providing a follow up activity and enrichment question to reinforce the concepts taught. The overall goal was for students to understand and be able to apply the process of adding negative numbers.