We've Got Your Numbers
In This Chapter
Understanding how place value turns digits into numbers
Rounding numbers to the nearest ten, hundred, or thousand
Calculating with the Big Four operations: Adding, subtracting, multiplying, and dividing
Getting comfortable with long division
In this chapter, I give you a review of basic math, and I do mean basic. I bet you know a lot of this stuff already. So, consider this a trip down memory lane, a mini-vacation from whatever math you may be working on right now. With a really strong foundation in these areas, you'll find the chapters that follow a lot easier.
First, I discuss how the number system you're familiar with — called the Hindu-Arabic number system (or decimal numbers) — uses digits and place value to express numbers. Next, I show you how to round numbers to the nearest ten, hundred, or thousand.
After that, I discuss the Big Four operations: adding, subtracting, multiplying, and dividing. You see how to use the number line to make sense of all four operations. Then I give you practice doing calculations with larger numbers. ...