MHB What is the nearest 10 mph to 684,288,000 pi miles per hour?

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The discussion revolves around rounding the value of 684,288,000 pi miles per hour to the nearest 10 miles per hour. The approximate value of 684,288,000 pi is calculated as 2,149,754,153.73965243556. To round this number to the nearest 10, the result is 2,149,754,150. The conversation clarifies the mathematical significance of pi as an irrational and transcendental number. Overall, the rounding process is confirmed to be straightforward and accurate.
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I KNOW HOW TO ROUND. I just want to make that clear but the way this question is worded makes no sense to me.

How do I round 684,288,000 pi miles per hour to the nearest 10 miles per hour?
 
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$$684288000\pi\approx2149754153.73965243556$$
 
pi is the standard transliteration of the Greek Letter, "\pi". In mathematics it is used to represent the constant ratio of the circumference to the diameter of a circle. It is an irrational number (in fact, a transcendental number) that can be approximated by 3.1415926535897932384626433832795 (that is what the calculator that comes with Windows shows) but continues infinitely.

Using that approximation (actually I hit the [math]\pi[/math] key on the calculator) [math]\pi[/math] times 684,288,000 is 2149754153.7396524355611253154576. That's probably what MarkFl did. You should be able to round that to the nearest 10.
 
Excellent. Thanks.

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2149754153 rounded to the nearest 10 is 2,149,754,150.
 
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