Addition Wizard
(requires Javascript to be enabled)
Enter a number in the box below and click the start button.

 Prediction...
>>>The computer will predict the sum of the original number and four other numbers before you enter them. You enter 2 numbers and the computer will enter 2 numbers. How can the computer do this?
Follow the steps below in order...
1. Enter a number and click the continue button. Messages:
2. This is the first computer entry. Go to step 3.
3. Enter a number and click the continue button.
4. This is the second computer entry. View the results.
Sum of the above four numbers and your original number. This should match the prediction above!
Can you explain how the computer can predict an answer without knowing in advance what numbers you will enter in step 1 and 3 above? The computer is not cheating! There is an explanation that makes mathematical sense. You could try this on your friends using a pencil and paper if you know how it works.
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