Unit 3, Lesson 12
Subtract Strategically
Grade 3
Preparation
Lesson Narrative
Students have learned several subtraction algorithms in prior lessons. Now students take time to consider when it makes sense to use an algorithm and when it makes sense to use another strategy, such as those learned in grade 2. Students will consider how thinking about the numbers in the problem can help them use their knowledge of subtraction to flexibly subtract within 1,000.
- Engagement
- MLR8
- Subtract within 1,000 and explain (orally) how a strategy was chosen based on the numbers in the expression.
- Let’s consider when to use algorithms and when to use other strategies to subtract.
Required Materials
Activity 2
Required Preparation
- Each group of 2 students needs a paper clip.
Teacher Reflection Questions
Reflect on your experience with the Number Talks in the curriculum. What moves or questions have improved the learning for each of your students during this routine? What improvements would you make next time?