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I did and still do a lot because when I was a little boy I often "designed" things in my head before falling asleep, now I design other things while I'm on the train or before falling asleep. You know, things as game mechanics (for games tha probably will never be) and... stuff.
Things that often involve multiplication, divisions, powers and even square roots (of course I approximate) or areas and volume calculations. I'm credited to be a fast calculator in facts 
Geek code v 3.12 {
GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- r++>+++ y+++*
Weapons extension: ma- k++ F+2 X
}
If you think 'goto' is evil, try writing an Assembly program without JMP. -- TNCaver
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Sounds like you and my Mom both read the same How to Troll Cashiers book. Her favorite trick when she has a new one is to go "$123" before they scan the first item. Hers is a running total as she fills the cart.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Chris Maunder wrote: With pen and paper.
You didn't do it in your head? Lazy. 
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Would this be a bad time to point out that that's arithmetic and not really mathematics at all then?
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Pah! Mathematics is derived from the Arithmetic base class!
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Hah! 
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I have a passing knowledge of the topic.
cheers
Chris Maunder
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Don't be so integralist about it, why differentiate so much when it's a simple derivation!
Geek code v 3.12 {
GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- r++>+++ y+++*
Weapons extension: ma- k++ F+2 X
}
If you think 'goto' is evil, try writing an Assembly program without JMP. -- TNCaver
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So... did you calculate 371.52 - 60.41 - 64.40 or (371.52 - 60.41) - 64.40?
There are two types of people in this world: those that pronounce GIF with a soft G, and those who do not deserve to speak words, ever.
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Don't confuse the poor guy, let him bask in his glory for a minute or two
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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Old school.
-1-1-1
371.52
- 60.41
- 64.40
========
246.71
--------
cheers
Chris Maunder
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Yeah, baby!!! 
There are two types of people in this world: those that pronounce GIF with a soft G, and those who do not deserve to speak words, ever.
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I calculated 371.52 - (60.41 + 60.40)
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Took me a couple minutes, but just did it in my head... That took way too much effort.
52 - 41 = 11... 371 - 60 = 311... 311.11... 11 - 40 = -29, so 310.71 - 64... 300.71 - 54... 250.71 - 4... 246.71.
Pen and paper may have been quicker.
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If you want a real fright, try doing long division.
Software Zen: delete this;
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I prefer short division myself. 
The United States invariably does the right thing, after having exhausted every other alternative. -Winston Churchill
America is the only country that went from barbarism to decadence without civilization in between. -Oscar Wilde
Wow, even the French showed a little more spine than that before they got their sh*t pushed in.[^] -Colin Mullikin
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That escalated quickly.
Software Zen: delete this;
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I like Joy Division... but that's not the topic, right?
Geek code v 3.12 {
GCS d--- s-/++ a- C++++ U+++ P- L- E-- W++ N++ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t++ 5? X R++ tv-- b+ DI+++ D++ G e++>+++ h--- r++>+++ y+++*
Weapons extension: ma- k++ F+2 X
}
If you think 'goto' is evil, try writing an Assembly program without JMP. -- TNCaver
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A few years ago when recovering from an operation I used to wake up at night several times. Looking at the clock and see it was 4:13 or 23:57. To pass the time I factorized the time as number (413 2357) from the head.
Yes European clock, No it was no operation for brain damage
413 = 7*59
2357 is prime,
note that 2357 consists of 4 consecutive prime numbers/digits. don't know if there are more with 4.
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I have a brother who is teaching high school for 'at risk students' (if they don't get help, they will simply drop out). At the end of the school year, an assessment was done of the students to identify where they stood in terms of basics: reading, writing, arithmetic.
They discovered the kids didn't know how to add/subtract/multiply/divide without a calculator... so, he will be doing remedial studies for a few weeks so they understand the basics.
Oh, and he is the English and History teacher; the Math teacher can't be bothered lowering himself to actually teach the kids.
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Chris Maunder wrote: Our kids are screwed.
If this was the soapbox, I would make a comment about how you treat your kids.
Mongo: Mongo only pawn... in game of life.
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Yay me to and I used to ssssssssuck at math!
246.71
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I regularly do basic math operations with pen and paper, when it's too complicated to do it by head and fetching a calculator or a computer would be longer than doing it 'the old way'.
I'd have done this one by head, however :p
while (true) {
continue;
}
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I'm sorry, but you're an idiot. It would have been easier for you to create a dummy (pun intended) profile and posted "need hlp plz" with this and gotten the answer quicker. None of us would have been the wiser. 
P.S. - In the event that you had different answers, you could have created a poll to weigh in on which answer is the most likely. Thereby saving lead and trees.
P.P.S. - I hope you use a mechanical pencil sharpener.
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I almost wrote an app to work it out.
Almost.
cheers
Chris Maunder
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