# Lesson 8

Groups Up to 110

### Lesson Purpose

The purpose of this lesson is to measure length and count and read numbers to 110.

### Lesson Narrative

In previous units, students counted quantities and read and wrote numbers up to 99. In previous lessons, students measured the length of objects.

The purpose of this lesson is for students to count a quantity between 100 and 110. In the first activity, students measure how tall they are using base-ten cubes and represent their work in a way that makes sense to them. In the second activity, students make sense of representations of larger numbers. In the lesson synthesis, students learn that 10 tens is 100.

- Action and Expression

- MLR8

Activity 1: Long Lengths with Small Cubes

### Learning Goals

Teacher Facing

- Measure length and count the number of length units for quantities up to 110.
- Read numbers to 110.

### Student Facing

- Let’s measure lengths that are longer than 100 cubes.

### Required Materials

Materials to Gather

Materials to Copy

- Representations of Numbers Over 80

### Required Preparation

Activity 1:

- Each group needs 120 base-ten cubes.

Activity 2:

- Create a set of cards from the backline master for each group of 2.

### Lesson Timeline

Warm-up | 10 min |

Activity 1 | 25 min |

Activity 2 | 15 min |

Lesson Synthesis | 10 min |

Cool-down | 0 min |

### Teacher Reflection Questions

Reflect on times you observed students listening to one another’s ideas today in class. What norms would help each student better attend to their classmates' ideas in future lessons?