How to Add and Subtract Positive and Negative Numbers (Number Line Method)
Confused about positive and negative numbers?
In this lesson, you will learn how to add and subtract integers using the number line method — explained step by step in a simple and clear way.
This video is part of our growing algebra foundation series on Maths Master Class.
In the previous lesson, we simplified expressions like:
-12 + 2 = -10
Now, we go deeper and understand why adding and subtracting integers works.
If you struggle with:
• Adding negative numbers
• Subtracting integers
• Understanding number lines
• Moving left and right correctly
• Crossing zero in calculations
This lesson will make it clear.
📘 What You Will Learn
✔ What integers are (positive numbers, negative numbers, and zero)
✔ How to draw and use a number line correctly
✔ The rule: move right when adding, move left when subtracting
✔ How to solve examples like 4 − 10, −3 + 2, and −8 − 7
✔ How to avoid common mistakes when working with integers
Mastering adding and subtracting positive and negative numbers is essential before moving into:
• Algebraic expressions
• Solving equations
• Working with brackets
• Advanced math topics
🚀 Watch Next
Make sure you watch the previous lesson on simplifying integers before this one.
Also watch:
1. Solving Equations with brackets and variables - • Solving Equations with Brackets & Variable...
2. Simplifying algebraic terms - • Simplifying Algebraic Expressions (Collect...
3. How to multiply algebraic terms - • How to Multiply Algebraic Terms | step by ...
And in the next video, we’ll learn how to add and subtract integers without using a number line — using faster mental math rules.
💬 Engagement
Try this challenge from the video:
-6 + 4 = ?
Pause, solve it, and drop your answer in the comments.
If this video helped you understand integers better:
👍 Like the video
💬 Comment your answer
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