Physical Materials

• Colored pencils
• Paper (plain or graph)
• Base ten blocks 
• Interlocking cubes

Digital Materials:

• Math Activity: Exploring Subtraction Strategies Interactive Slide Deck
  
• Math Activity: Exploring Subtraction Strategies Google Doc
  
• Virtual Number Lines
  
• Virtual Manipulatives

Instructions:

1. Before you begin, select from the videos below of teachers discussing strategy 2(b).

2. Complete strategy 2(d). As you explore this strategy, think about the connections you see across the different representations and descriptions. 
   
3. Choose either 2(c) or 2(e) to complete. Again, make sure you take time to consider the connections across the different representations and descriptions.
   
4. When you are finished, watch the Activity Synthesis video below.