If this doesn't work, message me and I'll bet I can guess about the only other answer you might have had.
Alternate Title: How To Impress A 12 Year Old
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
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...)
For instance, let's say 14-30 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.
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