In previous units, students sorted objects into given and student-created categories. Students wrote numbers to represent quantities and compared quantities. In this lesson, students sort objects by color and represent how many objects are in each group. Students compare the numbers of objects in each group and also compare the total numbers of objects with a partner. When comparing groups of objects, students may match the objects, use representations they created, or use their knowledge of the count sequence. The standards do not require students to compare written numbers beyond 10. The question in the Lesson Synthesis is posed so students can reason about how numbers and arrangements both can be helpful in comparing groups of objects. There is not a correct choice as both are valid.

When students compare written numbers or diagrams to decide which group has more, they reason abstractly and quantitatively (MP2).

If students need additional support with the concepts in this lesson, refer back to Unit 2, Section A in the curriculum materials.