# Lesson 1

Measure in Halves of an Inch

### Lesson Purpose

### Lesson Narrative

In grade 2, students learned how to measure lengths to the nearest inch. They also learned how to represent fractions on the number line in the previous unit.

In this lesson, students start by measuring the length of objects using an inch ruler. As students find objects whose length is not a whole number of inches, they consider how to partition the inches to get a more precise measurement. Students then partition a ruler to show halves of an inch and use the ruler to measure lengths to the nearest half of an inch. The lesson synthesis introduces students to **mixed numbers **as numbers that combine whole numbers and fractions less than 1.

Students use the rulers they make in this lesson again in future lessons.

- Engagement

- MLR2

### Learning Goals

Teacher Facing

- Measure lengths using a ruler marked with halves of an inch.

### Student Facing

- Let’s measure the length of objects around the room.

### Required Materials

### Required Preparation

Activity 1:

- Make copies and cut out the rulers from the blackline master (5 rulers per page).

Activity 2:

- Each student needs a ruler from the previous activity.

### 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

### Suggested Centers

- Estimate and Measure (1–4), Stage 2: Centimeters and Inches (Supporting)
- Target Measurements (2–5), Stage 1: Inches and Centimeters (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 |