A Mentalmath: Take 1000 and add 40 to it.
Now add another 1000. Now add 30. Add another1000. Now add 20. Now add another 1000. Now add 10. What is the total?
Do not cheat ----
4100
5000
5010
Comments : Did you get 5000?
See below --
The correct answer is actually 4100. Don'tbelieve it? Okay, check with your calculator!
