Unit 7, Lesson 10
Add within 1,000
Grade 2
Preparation
Lesson Narrative
In previous lessons, students used properties of operations, their understanding of the count sequence, and their understanding of place value to add within 1,000. They used different methods and representations to add by place and compose tens and hundreds.
In this lesson, students choose their own methods for adding within 1,000 and share their methods with their peers. They also have opportunities to explain why they chose their methods, based on the numbers in an expression. They also analyze the relationship between two numbers in an equation to find an unknown value. Students use what they know about composing units to find unknown three-digit numbers when they are partially covered.
- Action and Expression
None
- Explain (orally) strategies for finding the value of an unknown addend within 1,000.
- Explain (orally) strategies for finding the values of sums that are more and less challenging.
- Let’s find sums within 1,000 and explain our strategies.
Required Preparation
- Create a set of cards from the blackline master for each group of 2 students.
Teacher Reflection Questions
Unlike talking, listening is a difficult thing to observe. At what points in the lesson did you observe students listening to one another’s ideas today in class? What indicators do you have that they were listening?