The purpose of this Choral Count is to invite students to practice counting by 1 and notice patterns in the count. This will be helpful later in this lesson when students count up to 80 objects.

• “What do you notice about the numbers as we count?”

The purpose of this activity is for students to revisit Stage 2 of the Counting Collections center. In this activity, students organize, count, and represent a collection of 52 objects. Students should have access to double 10-frames, cups, paper plates, or other tools that can help them organize.

Students choose how to count their collection and how to represent their count. Students may count by one because they don’t trust that counting by ten yields the same result. Students may apply what they learned in previous lessons and create groups of ten using double-ten frames or other tools (MP5). Students may continue to count by one after they have organized the cubes into tens while others may count by ten, then one. Regardless of how they count, students need to be careful and organized to make sure they count accurately (MP6).

Although all students count a collection of 52 objects during this activity, when Stage 2 of the Counting Collections center is offered as a choice in later lessons, the collections should include quantities up to 99.

The purpose of this activity is for students to analyze a collection of connecting cubes that are arranged in towers of 10. Students analyze another student’s thinking about a representation of 48 cubes in towers of 10. When students explain that they disagree with Noah because a ten must include 10 ones, they show their understanding of a ten and the foundations of the base-ten system (MP3, MP7).

The purpose of this activity is for students to choose from activities that offer practice adding and subtracting. Students choose from any of the previously introduced stages of the centers. They are encouraged to choose the center that will be most helpful for them at this time.

• Check It Off
• Five in a Row
• Number Puzzles