# Lesson 13

Problems with Missing Information

### 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

- Let’s find out what information is needed to solve problems about measurements at the fair.

### Required Materials

Materials to Copy

- Info Gap: Pig Weigh-Off
- Info Gap Pumpkin Weigh-Off Cards

### 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.

### CCSS Standards

Addressing

### 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)

### Print Formatted Materials

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Student Task Statements | docx | |

Lesson Cover Page | docx | |

Cool Down | Log In | |

Teacher Guide | Log In | |

Teacher Presentation Materials | docx | |

Blackline Masters | zip |