The 7 - 11 -13 trick!
This trick makes you look like your brain is a mega fast calculator!
Ask a friend to write down ANY three digit number such as 231
or 884.
Ask them to multiply the number by
x 7
x 11
x 13
...but even if your friend has used a calculator, you will have
written down the answer ages ago!
THE SECRET: all you do is write out the starting number
twice!
So 231 will become 231231 and 884 will become 884884.
You don't believe it? Well try it on this calculator and see for
yourself! You work this calculator by clicking the mouse on the
buttons.
Go on, put in ANY three digit number then x 7 x 11 x 13 and see
what you get!
The 3367 trick:
This trick is similar to the 7-11-13 trick. It's harder to do, but it
looks far more miraculous!
Get a friend to pick any 2 digit number e.g. 74
x 3367
To work out the final answer you have to imagine the original
number written out three times e.g. 747474 then divide it by
three. 249158
This one takes practice, but unlike the others, it's very hard to see
how it's done!
THE MISSING DIGIT TRICK!
Here it is!
Cover your eyes in some way so that you can't see what your
friend is writing.
Ask a friend to secretly write down ANY number (at least four
digits long). e.g. 78341
Ask the friend to add up the digits... e.g. 7+8+3+4+1 = 23
... and then subtract the answer from the first number.
e.g. 78341 - 23 = 78318
Your friend then crosses out ONE digit from the answer. (It can
be any digit except a zero) e.g. 7 x 318
Your friend then reads out what digits are left .e.g. 7-3-1-8
Even though you haven't seen any numbers, you can say what
the missing digit is! EIGHT
THE SECRET
This great trick relies on the power of 9.
After your friend has added up the digits and subtracted them,
the answer will ALWAYS divide by 9. If a number divides by
nine, then when you add the digits up, they will also divide by 9.
If you check our example 7+8+3+1+8 = 27 which does divide
by nine.
When your friend crosses a digit out, he then reads out the
digits that are left. You add them up. In the example we had
7+3+1+8 = 19
All you do now is see what you have to add on to your answer
to get the next number that divides by nine! The next number to
divide by 9 after 19 is 27. So you need to add on EIGHT. This
is the number that was crossed out!
This trick makes you look like your brain is a mega fast calculator!
Ask a friend to write down ANY three digit number such as 231
or 884.
Ask them to multiply the number by
x 7
x 11
x 13
...but even if your friend has used a calculator, you will have
written down the answer ages ago!
THE SECRET: all you do is write out the starting number
twice!
So 231 will become 231231 and 884 will become 884884.
You don't believe it? Well try it on this calculator and see for
yourself! You work this calculator by clicking the mouse on the
buttons.
Go on, put in ANY three digit number then x 7 x 11 x 13 and see
what you get!
The 3367 trick:
This trick is similar to the 7-11-13 trick. It's harder to do, but it
looks far more miraculous!
Get a friend to pick any 2 digit number e.g. 74
x 3367
To work out the final answer you have to imagine the original
number written out three times e.g. 747474 then divide it by
three. 249158
This one takes practice, but unlike the others, it's very hard to see
how it's done!
THE MISSING DIGIT TRICK!
Here it is!
Cover your eyes in some way so that you can't see what your
friend is writing.
Ask a friend to secretly write down ANY number (at least four
digits long). e.g. 78341
Ask the friend to add up the digits... e.g. 7+8+3+4+1 = 23
... and then subtract the answer from the first number.
e.g. 78341 - 23 = 78318
Your friend then crosses out ONE digit from the answer. (It can
be any digit except a zero) e.g. 7 x 318
Your friend then reads out what digits are left .e.g. 7-3-1-8
Even though you haven't seen any numbers, you can say what
the missing digit is! EIGHT
THE SECRET
This great trick relies on the power of 9.
After your friend has added up the digits and subtracted them,
the answer will ALWAYS divide by 9. If a number divides by
nine, then when you add the digits up, they will also divide by 9.
If you check our example 7+8+3+1+8 = 27 which does divide
by nine.
When your friend crosses a digit out, he then reads out the
digits that are left. You add them up. In the example we had
7+3+1+8 = 19
All you do now is see what you have to add on to your answer
to get the next number that divides by nine! The next number to
divide by 9 after 19 is 27. So you need to add on EIGHT. This
is the number that was crossed out!
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