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Math Lesson 1.2.2 - Number Line

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Welcome to our Math lesson on Number Line, this is the second lesson of our suite of math lessons covering the topic of Number Sets, Positive and Negative Numbers and Number Lines, you can find links to the other lessons within this tutorial and access additional Math learning resources below this lesson.

Number Line

Numbers can be shown in a number line where the number zero is taken as origin. Positive numbers are usually placed on the right of origin while negative numbers are on its left, as shown in the figure below.

Math Tutorials: Number Sets, Positive and Negative Numbers and Number Lines Example

It is evident that the value of numbers increases from left to right in the number axis.

We use arrows to represent any increase or decrease of a number in the number line. For example, when the number 2 increases by 5 units, we can express this event in the number line as follows.

Math Tutorials: Number Sets, Positive and Negative Numbers and Number Lines Example

As a result, the new number obtained is 7 because 2 + 5 = 7. On the other hand, when the same number decreases by 8 units, we obtain

Math Tutorials: Number Sets, Positive and Negative Numbers and Number Lines Example

Negative numbers are very important; they allow us to express quantities that are smaller than zero. For example, if the outside temperature in a cold winter day is 5 Celsius degrees below zero, we write t = -5°C. Likewise, if a given location is below sea-level, we take its altitude as negative. For example, instead of saying "The Dead-Sea as the lowest place on Earth is 1360 ft below sea level", we simply say "The altitude of the Dead-Sea is -1360 ft."

More Number Sets, Positive and Negative Numbers and Number Lines Lessons and Learning Resources

Arithmetic Learning Material
Tutorial IDMath Tutorial TitleTutorialVideo
Tutorial
Revision
Notes
Revision
Questions
1.2Number Sets, Positive and Negative Numbers and Number Lines
Lesson IDMath Lesson TitleLessonVideo
Lesson
1.2.1Number Sets
1.2.2Number Line

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  7. Continuing learning arithmetic - read our next math tutorial: Operations with Numbers and Properties of Operations

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