# Use Reasoning

## Opening

# Use Reasoning

Watch the video that shows Jan and Carlos using reasoning about multiplication.

- What does Jan say about one thing she knows about multiplication?
- Does Carlos agree with what she says?
- What reasoning does Carlos use to support his opinion?
- What conclusion does Carlos first come up with?
- How do Jan and Carlos refine that conclusion?
- Do you agree with their conclusion?
- Do you think you would get a different conclusion if you started with a number less than 1?
- Test this idea.

VIDEO: Mathematical Practice 2