# Lesson 13

Problemas en los que falta información

### Lesson Purpose

The purpose of this lesson is for students to determine the information needed to solve problems involving weight.

### Lesson Narrative

In this lesson, students solve problems involving weight in two Information Gap activities. They interpret descriptions of situations involving all four operations and in which one or more quantities are missing. Students determine the information that they need to answer the questions and then reason about the solutions.

• Representation

### Learning Goals

Teacher Facing

• Determine information that is needed to solve measurement problems.
• Solve one-step word problems involving weight.

### Student Facing

• Descubramos qué información se necesita para resolver problemas de medidas en una feria.

### Required Materials

Materials to Copy

• Info Gap: Pig Weigh-Off, Spanish
• Info Gap: Pumpkin Weigh-Off, Spanish

### Required Preparation

Activity 1:

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

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 20 min Activity 2 20 min Lesson Synthesis 5 min Cool-down 5 min

### Teacher Reflection Questions

In this lesson, students had a chance to revisit subtraction that required decomposing hundreds into tens and tens into ones. What strategies are most students choosing for this work?

### Suggested Centers

• Number Puzzles: Addition and Subtraction (1–4), Stage 5: Within 1,000 (Supporting)
• Target Numbers (1–5), Stage 7: Subtract Hundreds, Tens, or Ones (Supporting)