Chapter 10

Decimals

Decimals are commonly used for money, as well as for weights and measures, especially when using the metric system. Generally speaking, decimals are easier to work with than fractions, provided that you know how to place the decimal point in your answer.

The Problems You’ll Work On

In this chapter, you work on the following types of skills:

Knowing how to change the most common decimals to fractions, and vice versa

Calculating to convert between decimals and fractions

Understanding repeating decimals and converting them to fractions

Applying the Big Four operations (adding, subtracting, multiplying, and dividing) to decimals

What to Watch Out For

Here are a few tips for working with decimals:

To change a decimal to a fraction, put the decimal in the numerator of a fraction with a denominator of 1. Then, continue to multiply both the numerator and denominator by 10 until the numerator is a whole number. If necessary, reduce the fraction. For example, change 0.62 ...