Visual Expressions

                    Lesson 1

                                 

                                                            Problem:                   Write the numerical expression for the models. Find the sum.

 Let one black tile equal +1 and one white tile equal -1.

 

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                                                            Solution                    The black tile is equal to +1. There are 5 black tiles the value is 5.

Step 1: 

                                  

                                                            Solution                    The white tile is equal to -1. There are 2 white tiles the value is -2.

Step 2:                        

 

Solution                    The sum will be 5 + (-2) = 3

Step 3: 

                      

Solution                    The answer is:  3

 Step 4:                                                          

                                                            Complete                                                                                                                                                   

 

                                                             Try two practice problems:  

 

                                                                            Write the numerical expression for the models. Find the sum.

Let one black tile equal +1 and one white tile equal -1.

 

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