Lesson objective: Rounding decimals to the tenths place.

This lesson helps to build procedural skill with rounding decimals to the tenths place. Number lines are used here because they help students better understand the relationship between different digits and place values. 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 tenth.

**Key vocabulary:**

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

**Special materials needed:**

- scratch paper and number lines, as needed