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How to Use a Number Line

Last Updated : 21 Aug, 2024
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Number line is a fundamental concept in mathematics that serves as the visual representation of the numbers and their relationships. It is crucial for understanding basic arithmetic, comparing values, and solving the equations. In this article, we will explore the essentials of the number lines including their construction, usage, and practical applications.

Our goal is to provide a clear and interactive guide for using the number lines effectively making it easier for students to grasp this vital mathematical tool.

What is a Number Line?

Number line is a straight horizontal line that represents numbers at equal intervals. It extends infinitely in both directions with the positive numbers to the right of the zero and negative numbers to the left. The Number lines are used for basic arithmetic operations, comparisons, and understanding the concept of the numbers.

Adding Using a Number Line

Adding numbers on the number line involves moving to the right. For example to add 3 and 4 start at 3 on the number line and move 4 units to right. The point we land on represents the sum.

Example: To calculate 3+4.

Step-by-step Solution:

Step 1. Start at 3.

Step 2. Move 4 units to the right.

Step 3. We land on the 7 so 3+4=7.

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Subtracting Using a Number Line

The Subtracting numbers on the number line involves the moving to the left. For example to subtract 2 from the 4 start at 4 on the number line and move 2 units to left. The point we land on the represents the difference.

Example: To calculate 4−2.

Step-by-step Solution:

Step 1. Start at 4.

Step 2. Move 2 units to the left.

Step 3. We land on 3 so 4−2=2.

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Making a Number Line with Negative Numbers

A number line with the negative numbers includes both the positive and negative values with the zero in the center. To create such a number line:

  • Draw a horizontal line.
  • The Mark zero in the center.
  • To the right of the zero mark positive numbers at equal intervals.
  • To the left of the zero mark negative numbers at equal intervals.
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Identifying Numbers Less Than or Greater Than Using a Number Line

To identify numbers less than or greater than a given number using the number line:

  • Find the given number on the number line.
  • The Numbers to the left of given number are less than it.
  • The Numbers to the right of given number are greater than it.

Example:

To find numbers less than 2:

  • The Locate 2 on the number line.
  • All numbers to the left of the 2 are less than 2.

Examples:

Example 1: Comparing Two Numbers Using a Number Line

Compare −25 and 15 using the number line.

Solution:

Step 1: Draw a number line with a range that includes −25 and 15.

Step 2: Mark −25 and 15 on the number line.

Step 3: Observe the positions of −25 and 15 on the number line. Since −25 is to the left of 15 we can conclude that: −25<15

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Example 2: Adding Two Numbers Using a Number Line

Add −7 and 7 using the number line.

Solution:

Step 1: Draw a number line that includes −7 and 0.

Step 2: Start at −7 on the number line.

Step 3: Move 7 steps to the right to the represent adding 7.

Step 4: The final position on the number line is 0. Therefore: −7+7=0

How-to-Use-a-Number-Line-5

Example 3: Subtracting Two Numbers Using a Number Line

Subtract 7 from 6 using the number line.

Solution:

Step 1: Draw a number line that includes the numbers 6 and −1.

Step 2: Start at 6 on the number line.

Step 3: Move 7 steps to the left to the represent subtracting 7.

Step 4: The final position on the number line is −1. Therefore: 6−7=−1

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Example 4: Multiplying Two Numbers Using a Number Line

Multiply 8 by 2 using the number line.

Solution:

Step 1: Start at 0 on the number line.

Step 2: Make two jumps of the 8 units each to the right.

Step 3: After the first jump we land at 8 and after the second jump we land at 16. Therefore: 8×2=16

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Conclusion

Using a number line is a fundamental skill in the mathematics that aids in understanding the arithmetic operations comparing numbers and visualizing the positive and negative values. The Mastering the use of the number line can significantly enhance mathematical comprehension and problem-solving the abilities.

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