# Lesson 24

Assess the Reasonableness of Solutions

### Lesson Purpose

The purpose of this lesson is for students to solve multi-step word problems by analyzing data, estimating, reasoning, and performing multiple operations. It also helps students to build fluency in using the standard algorithm to add and subtract multi-digit numbers up to 1 million. In each activity, students assess the reasonableness of their responses.

### Lesson Narrative

In the final lesson of the unit, students apply their knowledge of numbers in base-ten and their estimation and computation skills to solve problems about languages and populations in the United States. The census data used here prompts students to work with large numbers and to interpret them carefully.

• Representation
• MLR8

### Learning Goals

Teacher Facing

• Assess the reasonableness of responses.
• Solve multi-step problems involving the four operations.

### Student Facing

• Let’s solve problems and assess the reasonableness of solutions.

### Required Materials

Materials to Gather

### Lesson Timeline

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

### Suggested Centers

• Compare (1–5), Stage 7: Multi-digit Operations (Addressing)