A Memory Feat

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Adam was created perfect with a wonderful mind and memory. He had to name all the many different animals that God brought before him, and then would have had to remember all their names. To illustrate this you can then amaze your class by doing your own memory feat.

Have fifty cards, blank on one side and numbered from 1 to 50 on the other. On the same side write, apparently random, six-digit numbers across their centres. State that you are going to memorise all fifty of these six-digit numbers. Flick through the cards as you pretend to memorise them, give them a good shuffle, turn the blank sides upwards and offer the pack to about six volunteers who will each choose a card. One at a time, ask your volunteers to tell you the number of their card (i.e. between 1 and 50), and as they do so write on the board the six-digit number associated with that card! You will achieve a 100 percent success rate!

You will have probably realised by now that you don’t really memorise the numbers, rather you calculate them from the card number you are given. This is how you do it :-

To the number you are given (i.e. between 1 and 50), add eleven. Reverse this two-digit number. This will be the first two numbers you write on the board. Add these two numbers together to give your third number. However, if this is a two-digit number, ignore the first digit (i.e. 1) and write down the second. Proceed in this way, adding your last two digits together, until you have written down all six digits. Ask your volunteer to confirm this is the number they have on their card. A few of examples will make this clear :-

Card No. 15. Six-digit No. will be 628088.
Card No. 16 Six-digit No. will be 729101.
Card No. 17 Six-digit No. will be 820224.

As can be seen, even card numbers that are close to each other will produce completely different six-digit numbers.

by Maurice Sweetsur, http://objectlessons.blogspot.com/