# Lesson 10

Solve Problems with Decimals

### Lesson Purpose

The purpose of this lesson is for students to round and order decimals to the nearest one, tenth, and hundredth.

### Lesson Narrative

In this lesson, students round numbers to different place values in context. In addition to rounding numbers, students determine the possible value of a number, given the numbers it rounds to. When students interpret the speeds and times as they might be rounded to different places and how this would influence their order they reason abstractly and quantitatively (MP2).

While not required, number lines can be helpful throughout this lesson to visualize which whole number, tenth, or hundredth is closest to a given quantity. Locating all the numbers on the same number line accurately will be challenging, but students can locate them individually to help round or they can estimate the locations in order to compare decimals.

• Engagement
• MLR5

### Learning Goals

Teacher Facing

• Round decimals to different place values and order them.

### Student Facing

• Let's round and order decimals to solve problems.

### Lesson Timeline

 Warm-up 10 min Activity 1 20 min Activity 2 15 min Lesson Synthesis 10 min Cool-down 5 min

### Teacher Reflection Questions

Think about times when students were able to make connections to and build on the ideas of their peers during discussions today. What norms or routines allowed students to engage with other students’ ideas?

### Suggested Centers

• Tic Tac Round (3–5), Stage 3: Decimals (Addressing)
• Greatest of Them All (1–5), Stage 4: Decimals (Addressing)
• Jump the Line (2–5), Stage 2: Add and Subtract Tenths and Hundredths (Supporting)

### Print Formatted Materials

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