Operations With Signed Numbers

                    Lesson 1

Signed Numbers Addition and Subtraction Rules

1. When adding two numbers with the same signs:

Add their absolute values and write the sum with the sign of the numbers.

2. When adding two numbers with different signs:

Subtract their absolute values and write the difference with the sign of the number having the larger absolute value.

Problem:                   Solve: -6 + 15

Step 1: When the signs are different reorder the problem to make it appear as subtraction.

Solution -6 + 15 = 15 – 6 = 9

Step 2:                       

                                                             Solution                    The answer is:  9

 Step 3:                                                                      

 Complete   

                                                            Try two practice problems:  

Solve:

A. -5 + 15        

B. (–6) x (10)

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