# Number line. Concept and operation

## Do you know what the number line is and how to operate with it?

The online number line simulations on this page will help us to better understand what this interesting form of numerical representation is and how it can be used to operate with numbers.

The online number line simulations on this page will help us to better understand what this interesting form of numerical representation is and how it can be used to operate with numbers.

The number line is a fundamental mathematical tool used to represent and visualize real numbers in an orderly way. It consists of a straight line on which numbers are placed sequentially, so that each number has a unique position in relation to the others.

On a number line, a commonly used reference point is zero (0), which is placed at the center of the line. From there, positive numbers are placed to the right, and negative numbers are placed to the left. Each number has an equal distance from the others, so that the number line represents a uniform scale.

The number line allows us to visualize the ordering relationship between the real numbers. As we move to the right on the number line, the numbers increase in value, while as we move to the left, the numbers decrease in value. For example, if we have the numbers -3, 0, and 5 on the number line, we can observe that -3 is to the left of 0, and 0 is to the left of 5.

The number line is also useful for performing mathematical operations, such as addition, subtraction, and multiplication. For example, if we want to add 3 and -2, we can place the point corresponding to 3 on the number line and then move two units to the left to arrive at the result of 1.

In addition to whole numbers, the number line can represent decimal numbers and fractions. An appropriate subdivision of the line is used to show these numbers more accurately. For example, between the numbers 0 and 1 on the number line, we can divide the line into equal parts to represent fractions such as 1/2 or 3/4.

Below are several simulations and other educational resources, which can also serve as very illustrative examples. In addition, a selection of books and courses is included to help you broaden your knowledge of this subject.

## Integer numbers

What do elevation, account balances, and temperature have in common? They can all be represented on a number line. Compare integers on a number line and using inequality symbols. Discover the meaning of absolute value.

## Operations

Explore operations with integers using an authentic net worth context, then generalize with a number line. Experiment with adding and subtracting both positive and negative, and make predictions about whether the total will be positive or negative.

## Distance

Explore subtraction in multiple contexts, discover patterns and generalize how to interpret subtraction as distance.

### File

###### Mathematics  Maths Essentials  MathTrackX: Polynomials, Functions and Graphs

###### Algebra  College Algebra  Linear Algebra I: Linear Equations