Lesson objective: Apply understanding of rounding decimals to any place value.

This lesson provides an opportunity for students to apply their knowledge and understanding of rounding decimals to a mathematical situation. Students are asked to determine a mystery number by applying the given parameters to their understanding of place value and the rounding of decimals.

Key Concept students will use:

- Decimals can be rounded just as whole numbers can.

Skills students will use:

- Understanding of place value
- Rounding whole numbers to the nearest 10 or 100 (Grade 3, Unit 3)

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they round decimals to any place using number lines, place value charts, and their understanding of place value.

**Key vocabulary: **

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

**Special materials needed:**