**CHAPTER 3: ADDING AND SUBTRACTING DECIMALS **

**Lesson 4: Adding Decimals Using Mental Math **

**Goal**

Solve problems by using mental math to add decimals.

**Instructions for Use**

**Addition of Decimals**

Read the instructions and then scroll down to the “Practice” box. Click “Start”, add the decimals and then click on the button that shows your answer. The activity will tell you if you are correct. Click “Start” to get a new problem.

**Laser Beam**

Blast meteors as you answer addition and subtraction questions. Select the “Intermediate” level. Round the decimals and then estimate the sum or difference.

**Adding and Subtracting Whole Numbers and Decimals**

Play this game like jeopardy. Select a category and point value and then answer the question.

**Math at the Mall**

Use the arrow keys to move your character around the mall. To get the various places in mall, please move your character to the very end of the pathway. At every location you will have to use your adding and subtracting skills to complete several tasks, such as depositing money at the bank, or purchasing toys at the toy store.