Math Magic (What’s left when you add six numbers one after another?)
Author: tonagaiExecutions: 6003
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| What happens if you add the second and fifth numbers? | |
| You can already guess it at this point. | If the number is even, add the first and sixth digits; if it is odd, add 5 to that sum and take the first digit of the result. |
| The six numbers you entered | |
| Add the adjacent numbers to get the first digit | |
| Add the adjacent numbers to get the first digit | |
| Add the adjacent numbers to get the first digit | |
| Add the adjacent numbers to get the first digit | |
| Finally... |
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Repeat this process, and the final number that appears is the one you’ll guess the moment you finish writing the six numbers—it’s a math magic trick.
(From a tweet by Jun Mitani)