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What is 3.98 rounded to 1 significant figure?

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Rounding numbers can be useful when estimating the answers to Math calculations.  Round the numbers to the nearest ten, hundred or thousand.  For example 39 + 12 can be rounded to 40 + 10 = 50, therefore the answer will be approximately 50.
 


What is 3.98 rounded to 1 significant figure?





 
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