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View Full Version : Do this in your head

davelu
10-06-2005, 22:48
Do the math in your head.

Take 1000 and add 40 to it. Now add another 1000.
Now add 30. And another 1000.
Now add 20. Now add another 1000. Now add 10.

and No caculator!
Jay H 237
10-06-2005, 22:56
OK, 5000, not difficult to do off the top of my head.
davelu
10-06-2005, 22:59
OK, 5000, not difficult to do off the top of my head.

are you so sure its not that diffcult to do it off the top of ur head?? ;) and plus ure a mentor...that would make me even laugh moore:P

*can't stop laughing*
tiffany34990
10-06-2005, 23:08
i got 4100 out of my head....

if i missed something here...let me know....i am easily confused when i'm tired...
Jay H 237
10-06-2005, 23:09
Just because I'm a mentor doesn't mean I'm immune to mistakes! ;)

It's actually 4100. After I added it up again I got 4100.
Jaine Perotti
10-06-2005, 23:12
Same here... after some rethinking, I also got 4100.
sanddrag
10-06-2005, 23:22
4100 first try. /me is smart :)
davelu
10-06-2005, 23:23
Just because I'm a mentor doesn't mean I'm immune to mistakes! ;)

It's actually 4100. After I added it up again I got 4100.



hehe..u're not the only one...everyone on my msnlist got it wrong:P they all got 5000 even i did too:P
Kyle Love
10-06-2005, 23:28
Yup I got 4100 also...
David Guzman
11-06-2005, 00:23
Yeap 4100, I got it the first try but i think the part where you get confused is when you get to 4090 and then add ten if you are trying to do it fast it is very likely you will say 5000.

Its a pretty good one.

Dave
Jeremiah Johnson
11-06-2005, 01:25
Oh man.. you got me the first time. But then again I'm not a math major, and I suck at anything math related. But the second attempt... I got it... so I guess it's "2nd time is the charm" now... :D
RogerR
11-06-2005, 01:30
...i got 63.


...no wait, 4100. i get 4100.
Conor Ryan
11-06-2005, 10:55
well my first answer was 42, since it is the answer to everything.

Then I actually did some math and it ended up being 42 + 4058 or 4100.
Ashley Christine
11-06-2005, 11:55
You can just add the 1000's together and then add the smaller numbers together. it makes it a ton easier. I got 5000 first also ::embarassed::
Ryan M.
11-06-2005, 13:50
Hm... I'm muy confused...

Did it twice in my head and got 5000. Did it once on calc and got 4100. :confused:
Rafi Ahmed
11-06-2005, 14:00
Did it twice in my head and got 5000. Did it once on calc and got 4100.

Same here.
wilshire
11-06-2005, 14:35
yeah got 4100 the first time. try keeping the 1000's apart then add the smaller numbers. you get 5000 by mixing up their places and what not.
Ryan M.
11-06-2005, 15:34
yeah got 4100 the first time. try keeping the 1000's apart then add the smaller numbers. you get 5000 by mixing up their places and what not.Oops... you found what I did. Remember kids, 90 + 10 != 1000. ;)
Dorienne
11-06-2005, 21:04
I got 4100 first!!! =D Man I rule. :cool:
Brian Lesser
12-06-2005, 00:43
did it in my head and got 4100...

Really not that hard, but its a good way to confused others...
Ian Curtis
12-06-2005, 16:35
I got 4100 my first time, but I spend nearly a week trying to figure this out when I first saw it.
brandy836
12-06-2005, 19:45
I got 4100.

I had the exact same problem on my precalc exam, got 5000, and got it wrong. Ive learned to add since then.
wilshire
13-06-2005, 02:26
yeah quite a good question to test peoples ability of adding. obviousely alot of us cannot add yet we build successful robots. Makes you wonder sometimes how that works out :)