Number Line Expressions

                    Lesson 1

If we add a positive number, we move to the right on a number line.

                                                            If we subtract a positive number, we move to the left on a number line.

Always start from the position of the first number.

Problem:                   Represent 12 - 9 on a number line

Solution                    See the number line carefully

Step 1: 

                                                            Solution                    Operation 12 - 9 = 3

Step 2:      

Solution                    Start from 12 and move 9 places left

Step 3:     

Solution                    The answer is:  3

Step 4:

Complete                                                    

 Try two practice problems:  

Do the following:

A. Find sum -10 + (-40)

B. Find 15 + (-20)                

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