Lesson 7

The purpose of this lesson is for students to organize, count, and represent a collection of up to 120 objects or images using place value understanding.

In previous units, students counted a collection of up to 120 objects and wrote and read numbers in that range. Students recognized 10 tens as 100, but have not been introduced to the unit of a hundred.

In this lesson, students revisit counting large groups of objects or images and represent their count in different ways. With both objects and images, students consider how organizing into groups of ten is helpful.

If students need additional support with the concepts in this lesson, refer back to Unit 6, Section B in the curriculum materials.

• Prepare a chart with these start and stop numbers:

  Start

  Stop

  \(\phantom {0}67\\ \phantom {0}85\\ \phantom {0}90\\ 100\)

  \(\phantom {0}80\\ \phantom {0}95\\ 105\\ 120\)

• Create collections of between 90 and 120 objects, such as connecting cubes, counters, centimeter cubes, paper clips, pattern blocks, or other objects, for each group of 2 students.

As students worked today, whose ideas were heard, valued, and accepted? How can you make adjustments for tomorrow to ensure each student’s ideas are a part of the collective learning?