A short introduction

Solution to: Mental Arithmetic Test

Most people get 5000 as result, if they perform the calculation as fast as they can. But the answer is 4100. Because of the hurry, the tens and the hundreds are mixed up in the last step (4090 plus 10).

back to the puzzle

Copyright © 1996-2012. RJE-productions. All rights reserved. No part of this website may be published, in any form or by any means, without the prior permission of the authors.