This riddle must be done IN YOUR HEAD and NOT using paper and a pen. Try it - Take 1000 and add 40 to it. Now add another 1000. Now add 30. Another 1000. Now add 20. Now add another 1000. Now add 10. What is the total?

(scroll down for answer)

Did you get 5000?

The correct answer is actually 4100. Don't believe it? Check it with a calculator or on paper!! The brain sure knows how to play little tricks on us, doesn't it?