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Investigate the claim that 999997=-3. Learners discover how to subtract large numbers using a quick method of addition. The video provides examples and shows how adding machines and computers apply this approach to subtraction.
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Concepts
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Instructional Ideas
- Use board work to practice the subtraction by addition method
- Have pupils race to complete a problem with the traditional algorithm versus the subtraction by addition method
Classroom Considerations
- Expects a proficiency with the standard subtraction algorithm
- This video is hosted on YouTube
Pros
- Provides several examples
- Connects the method to a real-life application
Cons
- None