# directed numbers operations guess

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)?

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