The purpose of this activity is for students to learn Stage 3 of the Counting Collections center. Students are given a collection of up to 120 objects. They record an estimate that is too low, about right, and too high for how many objects they think are in their collection. Then they work with a partner to figure out how many objects are in their collection. Each partner records how many. Students may draw pictures, write numbers or equations, or use base-ten representations to represent their collection.

• “How did you organize the objects in your collection as you counted?”

The purpose of this activity is for students to practice measuring lengths and writing numbers up to 120.

Students choose any previously introduced stage from these centers:

• Write Numbers
• Estimate and Measure

• Display numbers 108, 109, 110, 111, 112.
• “What do you notice about these numbers?” (They all have 100. Some have a zero and some don’t. The numbers go in order 8, 9, 10, 11, 12.)