**Locating numbers on a number line :**

Usually we locate numbers on a number line in order to compare and order numbers.

That is, if we want to compare two numbers, first we have to locate the numbers on the number line and mark them.

The number which comes to the right of the other number is greater. The number which comes to the left of the other number is smaller.

To order the numbers, we have to locate the given numbers on the number line and mark them. Then, write the numbers from left to right to list them in order from least to greatest.

**Example 1 : **

Compare the numbers 3 and 6

**Solution : **

Let us locate the two numbers 3 and 6 on a number line and mark them.

Here, 6 comes to the right of 3.

Therefore "6" is greater than "3"

And 3 comes to the left of 6.

Therefore "3" is smaller than "6"

**Example 2 :**

Compare the numbers 6 and 9

**Solution : **

Let us locate the two whole numbers 6 and 9 on a number line and mark them.

Here, 9 comes to the right of 6.

Therefore "9" is greater than "6"

And 6 comes to the left of 9.

Therefore "6" is smaller than "9"

**Question :**

Order the numbers 12, 5, 9, 6, 1, 3 from least to greatest.

**Solution : **

Let us locate the numbers 12, 5, 9, 6, 1, 3 on a number line and mark them.

From the above number line, write the numbers from left to right to list them in order from least to greatest.

Thus, we get

**1, 3, 5, 6, 9, 12**

**Problem 1 :**

In 2010, Sacramento, California, received 23 inches in annual precipitation. In 2011, the city received 17 inches in annual precipitation. In which year was there more precipitation ?

**Solution : **

Locate the two numbers 23 and 17 on a number line and mark them.

23 is to the right of 17 on the number line.

This means that 23 is greater than 17.

We can write the above situation in terms of inequality as 23 > 17.

17 is to the left of 23 on the number line.

This means that 17 is less than 23.

We can write the above situation in terms of inequality as 17 < 23.

There was more precipitation in 2010.

**Problem 2 :**

John recorded the following golf scores during his first week at a golf academy. In golf, a lower score beats a higher score.

Graph John’s scores on the number line, and then list the numbers in order from least to greatest.

**Solution :**

**Step 1 :**

Graph the scores on the number line.

**Step 2 :**

Read from left to right to list the scores in order from least to greatest.

The scores listed from least to greatest are

**0, 1, 3, 5, 6, 9, 12**

**Compare whole numbers****Order whole numbers****Locating numbers on a number line****Identifying integers and their opposites****Positive and negative numbers****Integers and opposites****Comparing and ordering integers****Comparing positive and negative integers****Ordering positive and negative integers****Writing inequalities****Absolute value****Finding absolute value****Absolute Value in a real world situation****Comparing absolute values**

After having gone through the stuff given above, we hope that the students would have understood "Numbers on a number line".

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