Lesson objective: Round decimals to the hundredths or thousandths place.

This lesson helps to build procedural skill with rounding decimals to the nearest hundredth or thousandth. A number line is used here because it shows the relationship between different place values and the digits in those place values in regards to rounding. This work develops students' understanding that decimals can be rounded just as whole numbers can.

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they use number lines and their understanding of place value to round decimals to the nearest hundredths or thousandths.

**Key vocabulary:**

- decimal
- place value
- rounding
- tenths
- hundredths
- thousandths

**Special materials needed:**

- scratch paper and number lines, as needed