# directed numbers operations guess

- Author:
- Arthur Lee

- Topic:
- Numbers

Drag a and b along the number line.
Can you estimate the positions of , , and ?
Show

**points**to see four marked positions. Can you tell which operation gives each one?**Check**to see the answers. Try again with other positions of a and b. Is there always enough information for you to estimate?Would this be useful for classroom discussion?
What other questions will you ask (as a teacher / learner)?