As a class, we will decide on a central question to work on.
Make three smart guesses to answer the central question:
a guess too low, a guess too high, and a guess in the middle.
Place your guesses on the number line.
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What tools might you need to solve the problem?
What strategies might you use?
Solve to answer the central question.
What would have helped you achieve a more accurate estimate?
How might you avoid such a mistake in the future?
Explain your work to someone else? Did s/he do the work differently?
Can you explain the process using the other person's methods?