​​Be sure to read the teacher guide prior to running the task. When you’re ready to run the task, use the tabs at the top of the page to navigate through the lesson.

Through This Assessment Opportunity…

The purpose of this assessment is for students to demonstrate their understanding of the following big ideas.

• Subtraction names the missing part in terms of the whole
• Different subtraction situations will elicit different strategies 
• Number relationships provide the foundation for strategies to help students remember basic facts
• Efficient operational sense strategies should be number oriented 
• Subtraction can be used in either take away, comparison, or missing addend situations. Take away is explored in this task.
• Subtraction represents the difference or space between two numbers 
• Models can be used to connect concrete to abstract 

Students might write and/or model their responses independently. Students can also be interviewed by their teacher. 

An alternative assessment opportunity should be offered if this tool will not successfully capture what the student knows, understands or can do.