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Dj Bueno Posted 21 years ago
Jokes, Puzzles & Riddles
The Calendar Trick..
This trick makes you look like you've got the most awesome mental power. All you need is a calendar which has the dates lined up under the days of the week, so the numbers are arranged something like this:
. . 1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31
. . 1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31
The "9 number" trick
- Ask a friend to draw a 3x3 box around ANY nine of the numbers on the calendar.
- Almost immediately you can say what the nine numbers all add up to!
- See how long it takes your friend to check the answer on a calculator. (Yawn...snore...zzzz...)
- Ask a friend to draw a 5x4 box around ANY twenty of the numbers on the calendar.
- Almost immediately you can say what all twenty numbers add up to!
For instance, let's say the red numbers are chosen.
. . 1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31
They add up to 198.
 |  |
THE SECRET: All you do is look at the number in the middle and multiply it by 9.
In this case the middle number is 22 and 22 x 9 = 198.
HANDY TIP: To multiply by 9 quickly, just multiply by 10 then subtract your number.
So to get 22 x 9 you multiply 22 x 10 =220 (easy!) and then subtract 22. With a bit of practise you can do this quickly in your head.
The "20 number" trick
For instance, let's say the yellow numbers are chosen.
. 1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 27 28 29 30 31
They add up to 290.
THE SECRET: Add together the smallest and the largest numbers in the group. Multiply the answer by 10.
In this case the smallest number is 2 and the largest is 27, so 2 + 27 = 29. Then 29 x 10 = 290.
With the "20 number trick" if the calendar month is February occasionally it will not be possible to put a box round 20 numbers.
Top answer
Nice one Dj I like it I will have to remember those!
- Nice one Dj I like it I will have to remember those!
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7 Answers
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Hey! My dearest English teacher guessed the trick at once!! It was unbelievable..She glanced at the paper,did some calculations and in 19 seconds she told us that the only thing to do was "to multiply the number in the center of the box by 9." lol.. What a clever woman..
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Dj Bueno
This trick makes you look like you've got the most awesome mental power. All you need is a calendar which has the dates lined up under the days of the week, so the numbers are arranged something like this:
. . 1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
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