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Chapter 1

The Big Four Operations

The Big Four operations (adding, subtracting, multiplying, and dividing) are the basis for all of arithmetic. In this chapter, you get plenty of practice working with these important operations.

The Problems You’ll Work On

Here are the types of problems you find in this chapter:

Rounding numbers to the nearest ten, hundred, thousand, or million

Subtracting one number from another, including subtraction with borrowing

Multiplying one number by another

Division, including division with a remainder

What to Watch Out For

Here’s a quick tip for rounding numbers to help you in this chapter: When rounding a number, check the number to the right of the place you’re rounding to. If that number is from 0 to 4, round down by changing that number to 0. If that number is from 5 to 9, round up by changing that number to 0 and adding 1 to the number to its left.

For example, to round 7,654 to the nearest ...

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