Chen's pencils

This Application Problem is a part of the Lesson 32, Unit 4, Grade K. Have blue and red pencils available for students working below grade level and students who are still struggling with the part-whole relationship. Allow them to use the pencils to model the problem before asking them to draw the problem and represent it using number bonds. Decomposition of the number 9 and discussion about alternatives serve as the anticipatory set for today's put together with both addends unknown objective.