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

[mathdad]

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?

 

[MarkFL]

\(\displaystyle 684288000\pi\approx2149754153.73965243556\)

 

[HOI]

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 \(\displaystyle \pi\) key on the calculator) \(\displaystyle \pi\) times 684,288,000 is 2149754153.7396524355611253154576. That's probably what MarkFl did. You should be able to round that to the nearest 10.

 

[mathdad]

Excellent. Thanks.

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Note:

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