• 4.3: Converting Between Decimals and Fractions

Decimals give us the same information as fractions. Therefore, we can write the same number as a decimal or a fraction. For example, 0.25 equals 25/100, which can be reduced to ¼. Because decimals and fractions give us the same information, we need to be comfortable converting between them.

• 4.4: Converting Repeating Decimals to Fractions

The examples in the last section involved decimals that ended. For example, we saw that 0.25 equals ¼. However, some decimals are repeating, meaning that they go on infinitely. These repeating decimals are still equal to fractions.

• 4.5: Adding and Subtracting Decimals

When adding and subtracting decimals, we need to pay attention to the placement of the decimal point.

• 4.6: Multiplying Decimals

When multiplying decimals, we also need to keep track of the decimal point.

• 4.7: Dividing Decimals

The last basic mathematical operation we need to perform with decimals is division. Division with decimals works in a similar manner to multiplication with decimals.

• 4.8: Word Problems Using Decimals

Decimals appear in many places in the real world, especially in problems involving money.