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Unit 3: Everyday Math

3 Introduction

In this unit you will investigate the four basic operations—addition, subtraction, multiplication, and division—including the math language associated with them. You will also get the chance to find out about different strategies to help you deal with mental math problems.

Practice Quiz

To check your understanding of these operations before you start, give the Unit 3 pre quiz a try, then use the feedback to help you plan your study.

The quiz checks most of the topics in the unit, and should give you a good idea of the areas you may need to spend most time on. Remember, it doesn’t matter if you get some or even all of the questions wrong—it just indicates how much time you may need for this unit!

Click here for the pre quiz. [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)]

So far, we’ve studied how to write, estimate, and round numbers. Now we will begin to perform calculations with them. First, let’s look at addition and subtraction of numbers.