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.
Putting It All Together
Answer these open ended questions on your own or with others to form deeper math connections.
Open-ended question 1
How can you tell if your mental calculation is reasonable? How can estimation help you check your answer?
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Open-ended question 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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Prerequisite Resources
More from Estimating Decimal Sums and Differences
