Comparing Decimal Estimates at Different Place Values

Comparing Decimal Estimates at Different Place Values

Observe how choosing a rounding place value shapes the estimate of a decimal sum or difference.


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Putting It All Together

Answer these open ended questions on your own or with others to form deeper math connections.

Open vraag 1

How can you tell if your mental calculation is reasonable? How can estimation help you check your answer?

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Open vraag 2

Marcus and Mike ran 100 m in 12.27 seconds and 12.33 seconds respectively. Can you tell who won the race if you round their times to tenths of seconds? Explain your reasoning.

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