How to win free BEER with a calculator
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(137 votes)
Published: Jul 14, 2003 12:00 a.m.
In 4 Favorites Lists
Viewed 2255 times |
Take a calculator, preferably a cheap solar one with small buttons. Go up to a guy and bet him a beer that you can add 5 sequential numbers, anywhere from 1 to 100, faster than he can add them on the calculator.
Heres an example: 68 + 69 + 70 + 71 + 72. Answer: 350.
Another: 55 + 56 + 57 + 58 + 59. Answer: 285.
And a third: 87 + 88 + 89 + 90 + 91. Answer: 445.
How is this possible? While your mark is fumbling around with the buttons on the cheap little calculator, just multiply the MIDDLE number by 5. The examples above are 70 x 5, 57 x 5, and 89 x 5, respectively.
70 x 5 is a simple number to multiply, but how do you multiply other numbers by 5? You must first multiply by 10, then divide by 2. This breaks it down into simpler parts. Ill use the second and thrid examples.
57 x 5:
57 x 10 = 570. Now you need 570 / 2. You can do this by taking 500 / 2, and 70 / 2, and adding them.
500 / 2 = 250. 70 / 2 = 35.
250 + 35 = 285, your final answer.
Heres the third example, 87 + 88 + 89 + 90 + 91.
89 x 10 = 890.
800 / 2 = 400.
90 / 2 = 45.
400 + 45 = 445, final answer.
Enjoy the free beer, and try to pick a mark who looks like he cant likely beat you up when he loses.
Proof (eggcellent):
let the 5 numbers = x,x+1,x+2,x+3,x+4
This forms an arithmetic progression with
a=x and d=1, let x+2=M (middle term)
To find the sum of an AP (Sn) we can use the formual
Sn= n/2 (a+l) [where l = last term)--1
l also equals, x+(n-1)d [where d=1 in this case] --2
Substituting 2 into 1 gives,
Sn = n/2 (2x+n-1) [this step is not necessary in this case]
Now in this case n=5, so:
S(5)= 5/2 (2x+4)
Cancelling the factor of 2 from denominator and numerator,
S(5) = 5.(x+2)
And (x+2) is of course the middle term.
So, S(5)=5M |
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 | Dec 18, 2004 6:41 pm -
buhhhhhhhhhhhh dude thats not something my brain can work out with. i looked at your profile and i’m guessing your not 21 or younger so GET OUTTA HERE! |
 | Dec 20, 2004 7:10 pm -
You’ll never be promoted from the grill to drive-thru cashier if you can’t handle numbers from 1 to 100. |
 | Dec 22, 2004 7:39 pm - from phycho
you mother fucking bastard. if you had better thing to do (like plastic sergery) you would not be wasting your time reading stupid ideas fuck you your ideas and you comments |
| Dec 22, 2004 8:21 pm -
Here’s a practical use for manipulating numbers from 1 to 100:
You work at a Break Windy’s (Wendy’s) in Columbus, Ohio. It’s your day off, but the regular drive-thru queen abruptly quits, so you’re on the drive-thru register today. A 1985 Oldsmobile, with plastic over the broken windows, dents and rust everywhere, a length of rope holding the trunk shut, and blue smoke pouring from the tailipie, pulls up to the speaker. The driver orders two Junior Bacon Turdburgers, a Biggie Flies (fries), and a Biggie Diet Coke. Each of these items is on the 99 Cent Value Menu. Under Ohio law, the sandwiches and potatoes are not taxed, but the carbonated soft drink is subject to a sales tax of 6.75 percent. Fortunately, the cash register calculates all of this for you. The total, with tax, is $4.03. The driver hands you a $20. You check it to see that it’s not counterfeit. But for an instant, you gawk at the shapely tits os a 17 year old on the other side of the counter as she awaits her order. Instead of entering 20.00 on the register, you enter 200.00. The drawer pops open, The register says you owe the customer $195.97. You can’t re-enter the correct amount. Customers are waiting. What do you do?
1. Give the customer $195.97. Your drawer will be short by $175.97. Dumbass.
Call the manager. The manager already suspects you’re stupid, and asking for his help conforms it.
Manipulate the numbers yourself. Ignore what Mr. Cash Register says, and start counting forward, beginning with $4.03, and stop when you get to $20.00. Start with the smallest. Grab 2 pennies. Now you’re up to $4.05. Two dimes, $4.25. Three quarters, $5.00. A $5 bill brings you to $10.00. A $10 bill makes $20. Give the customer $15.97. Now you can manipulate simple numbers a couple of ways. |
 | Jan 14, 2005 7:46 am -
146 |
 | Jan 22, 2005 11:35 pm -
im in collge to this inst hard |
 | Jan 22, 2005 11:36 pm -
wow, im really suprised at how good of an idea this is because, for one if you went up to somebody and asked to make a bet like that............ you might hopefully get some since slapped into ya |
| Feb 06, 2005 9:39 pm -
You’re too young to hang out in bars, but if you intend for people to assault you, try to pick someone with a lot of money, from whom you can collect damages in the ensuing lawsuit. |
 | Jun 19, 2005 8:39 am -
my IQ is 140 last year. its probly gone up since then |
 | Jul 03, 2005 3:55 am -
I have no idea what that means but 3 for the beer! |
 | Jul 28, 2005 2:08 pm -
Nice one, H-dogg. You never let me down. |
 | Aug 04, 2005 6:52 pm -
All i can say is GOOOD |
| Aug 13, 2005 9:55 am -
H-Dogg = my HERO!!! |
 | Nov 28, 2005 4:28 am -
Could be used for any thing, money, beer, the tv clicker etc. |
 | Jan 14, 2006 4:25 pm -
Sweet. |
 | Ja 29, 2006 10:23 am -
Excelent egg. I’m goin to go piss off my highschool calculus teacher with this one. Thanks. |
 | Feb 11, 2006 7:26 pm -
"my IQ is 140 last year. its probly gone up since then" wow ur iq doesnt change dumbass unless u have a brain problem or something |
 | Apr 07, 2006 10:09 am -
just copy paste and print the answers out on a piece of paper and take the to the bar write the on your hand and read them off and bet as many as you want to a drunk |
 | Jan 01, 2007 1:35 am -
5* w007! It worked! |
 | Jan 05, 2008 9:31 pm -
Columbus Ohio and Wendy’s FTW |
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