Lesson 21
Zeros in the Standard Algorithm
Lesson Purpose
The purpose of this lesson is to use the standard algorithm when the minuend has several zeros.
Lesson Narrative
These problems can be challenging for students because they require special attention to make sense of how the multiple regroupings work and how they are recorded in the standard algorithm.
- Representation
- MLR8
Learning Goals
Teacher Facing
- Use the standard algorithm to subtract in the ten-thousands when the minuend has several zeros.
Student Facing
- Let’s subtract from numbers with several zeros.
Required Materials
Materials to Gather
Required Preparation
Lesson Timeline
| Warm-up | 10 min |
| Activity 1 | 20 min |
| Activity 2 | 15 min |
| Lesson Synthesis | 10 min |
| Cool-down | 5 min |
Teacher Reflection Questions
Which parts of this lesson gave you insight into how students are subtracting across zero? What insights did you gain?