Teacher begins lesson by reminding students of part-part-whole model with addition and how they will now practice using that model with subtraction.

Teacher uses part-part-whole boxes to track money spent in book.  This model helps students visualize the concept of part and whole as well as the missing part. 

The teacher stops many times when reading book to check for students understanding of total of money.  The teacher asks students to use the part-part-whole model and use number sentences to explain their thinking. The teacher makes sure that students understanding the math happening in the book.  Additionally, the teacher asks students questions to share their thinking by responding individually or chorally.  

Student explains their answer with multiple sentences.  The teacher questions her thinking, and the student connects her understanding of the word problem with the math needed to solve the problem. The student continues to describe how she will solve the problem based off of what she knows about the problem.

Student chooses to use base ten blocks to solve problem. Partners will then complete problems to solve as they choose.

Throughout the partner work, students are choosing tools and strategies to help them arrive at the answer.  The teacher encourages students to use what ever strategy is best for them. 

Partners share their thinking to class on how they solved the problem.  The female student includes her questions to her partner\'s thinking in her explanation in addition to clarifying the math procedures.