Guess and Check

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• Chapter 6
• Guess and Check

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• As Emi looked up at the waterfall, she said,
  Wow, I think the top of that fall is about 20
  feet more than three times the height of that
  young redwood! Margit said, No, I think its
  about 50 feet less than four times the height of
  the redwood. If both are approximately right,
  about how tall is the redwood and how high is the
  waterfall?

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Start a guess-and-check chart.

Put a lot of information in the column titles.
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Be ready to start over.
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Build from smaller to bigger numbers.
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Bracket to close in on an answer.
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Strategy Guess and check

• Start a guess-and-check chart.

• Be ready to start over.
• Build from smaller to bigger numbers.
• Bracket to close in on an answer.
• Be careful to rate guesses correctly.
• Avoid arithmetic mistakes.