Let have a Test:

You need to make a calculation. Please do neither use a calculator nor a paper. Calculate everything “in your brain”.

## Take 1000

## and add 40.

## Now, add another 1000.

## Now add 30.

## Now, add 1000 again.

## Add 20.

## And add 1000 again.

## And an additional 10.

Quicker you see the answer, sharper you are!

## 24 comments add your comment

got it right the first time After the 30, i was expecting 20..and 10. As that sum is 100 + 4(1000); did not find it so tough

got it right the first time After the 30, i was expecting 20..and 10. As that sum is 100 + 4(1000); did not find it so tough

Fool me once shame on you, fool me twice shame om me.

I have had this puzzle before, so this time I got theright answer.

Fool me once shame on you, fool me twice shame om me.

I have had this puzzle before, so this time I got theright answer.

witty :)

witty :)

As always, You’ve a great sense of humor!

As always, You’ve a great sense of humor!

I got 3100….

You said take a thousand so I instantly thought to subtract a 1000 from zero to start off with making it -1000

Plus 40 makes it -960

Plus 1000 makes it 1040.

Add 30 makes it 1070

Add 1000 makes it 2070

Add 20 makes it 2090

Add 1000 makes it 3090

Add 10 makes it 3100.

-960 and plus 1000 makes only 40. so your answer should have been 2100. :)

I got 3100….

You said take a thousand so I instantly thought to subtract a 1000 from zero to start off with making it -1000

Plus 40 makes it -960

Plus 1000 makes it 1040.

Add 30 makes it 1070

Add 1000 makes it 2070

Add 20 makes it 2090

Add 1000 makes it 3090

Add 10 makes it 3100.

-960 and plus 1000 makes only 40. so your answer should have been 2100. :)

I got 4100 after reading it, but if I had heard it, I would’ve probably gotten 5000.

Why: I saw four 1000’s and a group of four other numbers that I knew added up to 100, so I thought 4*1000 + 100. If I had heard it, the numbers would have been added in order (incorrectly) and I wouldn’t have been able to do this weird visual thing I do with numbers.

I got 4100 after reading it, but if I had heard it, I would’ve probably gotten 5000.

Why: I saw four 1000’s and a group of four other numbers that I knew added up to 100, so I thought 4*1000 + 100. If I had heard it, the numbers would have been added in order (incorrectly) and I wouldn’t have been able to do this weird visual thing I do with numbers.

I also first got with 5000 in an instant but when I understood my mistake, I figured out it as a awesome question.

I also first got with 5000 in an instant but when I understood my mistake, I figured out it as a awesome question.

You got me. i was so proud when i came up with 5000 in a flash.

So now I know i’m not a genius…

Ha ha! When counting by head, one can make these kind of mistakes. Ask any math frequent buddy, you’ll probably get the same answer. Key point of this test is the last step: Four thousands and Ninety plus Ten equals what? : Five Thousand ;-)

You got me. i was so proud when i came up with 5000 in a flash.

So now I know i’m not a genius…

Ha ha! When counting by head, one can make these kind of mistakes. Ask any math frequent buddy, you’ll probably get the same answer. Key point of this test is the last step: Four thousands and Ninety plus Ten equals what? : Five Thousand ;-)

it’s nice….

it’s nice….