8/7/2023 0 Comments Pick a number 1 8![]() Then, I'll tell you my number is Green on Card 81, Red on Card 3 and Card 9, and it doesn't appear on Card 1 or Card 27.Subtract the red total from the green total, and you have their secret number.Add up the cards on which their number is Red.Add up the cards on which their number is Green.Show them the cards one by one, and ask "Is your number on this card? And if so, what color is it?".Also, the cards are labeled Card 1, Card 3, Card 9, Card 27 and Card 81. If you download that cards you'll see that the cards have some numbers printed in red, and some in green. So, I made a new set, with five cards instead of seven - and slightly different rules. When I was testing out the first set of magic cards, some people complained there were too many questions to answer. Getting numbers up to 100 with only 5 cards Add up the first numbers on all the cards they say Yes to (the "first numbers" on the cards are 1, 2, 4, 8, 16, 32, 64, 128, 256 and 512 - but your subject can't say Yes to every card.Ask the subject to think of a number from 1 to 1000.With a set of only 10 magic cards, it's possible to divine any number from 1 to 1000! Of course, the cards are a lot bigger (and the numbers you have to add are a lot bigger too!), but if you're game, you can download and print the set of 10 cards that you need. This time, the first numbers of the cards are 1, 2, 4, 8, 15, 28 and 56. Note that the subject's number should still be between 1 and 100.Download the cards here, print them out, practise the trick, and try it on your friends!. ![]() I've prepared another set of seven cards where the most addition you'll ever have to do is to add up five numbers. In the version above, you'll sometimes have to add six of the seven numbers - for example, if the subject picks 63 or 95. Be careful not to start muttering "Um, let's see, carry 1, that makes 42, then." Make sure people don't realise you are adding anything up.Get good at adding up the cards in your head! It might help to memorise a few particular sums : 64+32=96, 64+16=80, 32+16=48. ![]()
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