# Lesson 20

More Practice to Represent and Solve

### Lesson Purpose

The purpose of this lesson is for students to continue to represent and solve two-step word problems, including problems in which not all necessary information is given up front.

### Lesson Narrative

In this lesson, students continue to solve problems but encounter those that cannot be solved right away because of missing information. They learn the Information Gap routine, which prompts them to consider the information that is needed to solve a problem and ways to ask for it.

The first activity introduces students to the routine. In the second activity, students are given more time to solve two-step word problems as they engage in the routine.

• Representation

### Learning Goals

Teacher Facing

• Represent and solve two-step word problems.

### Student Facing

• Let’s represent and solve more problems.

### Required Materials

Materials to Copy

• Info Gap: Bake Sale

### Required Preparation

Activity 2:

• Create a set of cards from the blackline master for each group of 2.
• Keep set 1 separate from set 2.

### Lesson Timeline

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

### Teacher Reflection Questions

How did the Information Gap routine support students in making sense of two-step problems?

### Suggested Centers

• Tic Tac Round (3–5), Stage 1: Nearest Ten or Hundred (Addressing)
• Number Puzzles: Addition and Subtraction (1–4), Stage 5: Within 1,000 (Addressing)
• Five in a Row: Multiplication (3–5), Stage 2: Factors 1–9 (Supporting)