Whole Numbers – Uses of the Number Line – Part 1

# Whole Numbers – Uses of the Number Line – Part 1

• Subtraction on Number Line
• Summary
• What’s Next?

In our previous segment, we learnt about Whole numbers and how to represent them on the number line. In this segment, we will learn how to perform mathematical operations like addition and subtraction on the number line.

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## How to add numbers using a number line?

This is what a number line looks like. Let us now perform addition on this number line.

Example: 2 + 4

First, mark the number 2 on the number line. Since we are adding 4 to it, add 4 arrows from left to right.

That is from 2 → 3, then 3 → 4, then 4 → 5, and lastly 5 → 6.

We thus arrive at the answer, that is 2 + 4 = 6

## Adding on the number line

Alternately, we can mark 4 on the number line and start marking two arrows from it to the right. This will also give us 6.

## How to subtract numbers using a number line?

When subtracting numbers on a number line, we need to keep 2 rules in mind:

• Unlike addition, which goes from left to right, subtraction goes from right to left.
• Always start counting or subtracting from the higher number of the two.

Example: 7 – 5

First, we draw a number line containing whole numbers. Since 7 is the greater of the two numbers, we mark 7 first.

To subtract 5, we move one step at a time, 5 times, to the left as shown in the diagram below. We thus arrive at the answer, that is 7 – 5 = 2.

## Subtracting on a number line

Summary

 Addition on Number Line Mark either of the two numbers, that is to be added, on the number line. Move from left to right, the number of steps as the number to be added. Subtraction on Number Line Mark the higher number of the two on the number line. Move from right to left, the number of steps as the number to be subtracted.

## What’s next?

In our next segment of Class 6 Maths, we will learn how to use the number line to multiply whole numbers.

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