# Outside the Beltway

## Math Skills Come in Handy

Another nail in the coffin of the idea that all math beyond arithmetic is useless unless you’re an engineer: free pizza for those who can do geometry in their heads.

That, sadly, leaves me out. There was a time when I could multiply double digit numbers not ending in zero by 3.14 in my head and the like but they are long gone.

via Chaz Hill

FILED UNDER: Economics and Business, Education
James Joyner is Professor and Department Head of Security Studies at Marine Corps University's Command and Staff College. He's a former Army officer and Desert Storm veteran. Views expressed here are his own. Follow James on Twitter @DrJJoyner.

1. Maniakes says:

“Three and a bit” is an excellent approximation of pi for mental approximations. 3.0 is wrong by less than 5%, and you can fudge that by rounding up somewhere else in your calculation.

2. Rodney Dill says:

I had something figured out for Domino’s years ago, where they stated that 2 smalls were more than 1 large. (I think the small was a 10 inch and the large was a 14 inch). Technically they were right, but if you assume 1 inch crust (without topping) around the edge of the pizza you got more surface area of toppings with the large, than with the two small. Of course what you really need to know is the weight or volume of the pizza material to do a good comparison as pizzas aren’t really just 2 dimensional. That about cover it?

I thought so.
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