**Rational Numbers on the Number Line :**

A number line can be used to show the sets of natural number, whole numbers and integers.

Values greater than 0 or positive numbers, are listed to the right of 0, and values less than 0, or negative numbers, are listed to the left of 0.

Another set of numbers you can display on a number line is the set of rational numbers.

A rational number is any number that can be written in the form a/b, where a and b are integers and b ≠ 0. Some examples of rational numbers are shown below.

1/2, -2/3, 17/5, 15/(-3), -14/(-11), 3/1

A rational number can also be expressed as a decimal that terminates, or as a decimal that repeats indefinitely.

0.5, -0.333333.., 3.4, 2.6767… -5 1.2727.....,

- 1.23568994141…

Natural number Whole numbers Integers Rational numbers |
{1, 2, 3,.............} {0, 1, 2, 3,..................} {.........,-2, -1, 0, 1, 2,............} Numbers represented in the form a/b, where a and b are integers and b ≠ 0. |

To graph a set of numbers means to draw, or plot, the points named by those numbers on a number line. The number that corresponds to a point on a number line is called the coordinate of that point.

**Example 1 :**

Name the coordinates of the points graphed on each number line.

**Solution :**

The dots indicate each point on the graph. The coordinates are {-4, -3, -2, 1, 2}.

**Example 2 :**

Name the coordinates of the points graphed on each number line.

**Solution :**

The bold arrow on the right means that the graph continues indefinitely in that direction. The coordinates are {1, 1.5, 2, 2.5, 3, …}.

**Example 3 :**

Represent the set of numbers on the number line

{…-4, -2, 0, 2, 4, 6}

**Solution :**

**The bold arrow on the right means that the graph continues indefinitely in that direction. **

**Example 4 :**

Represent the set of numbers on the number line

{-4/3, -1/3, 2/3, 5/3}

**Solution :**

**Example 5 :**

Represent the set of numbers on the number line

{integers less than 3 or greater than or equal to 5}

**Solution :**

**The bold arrow on the right means that the graph continues indefinitely in that direction. **

**Example 6 :**

Name the coordinates of the points graphed on each number line.

**Solution :**

The coordinates represented in the above graph are

{-2, 1, 2, 5}

**Example 7 :**

Name the coordinates of the points graphed on each number line.

**Solution :**

The coordinates represented in the above graph are

{-11/2, -9/2, -7/2, -5/2, -3/2}

**Example 8 :**

Represent the set of numbers on the number line

{-4, -2, 1, 5}

**Solution :**

After having gone through the stuff given above, we hope that the students would have understood how to plot rational numbers on a number line.

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