Saturday, 17 October 2015

The Missing Digit Math Trick in Urdu/English

If you are looking for the math trick of missing digit then you are at right place because here we have shared with you the Missing Digit Math Trick in Urdu/English 

The Missing Digit Math Trick in English

The Missing Digit Trick

Here it is
Go and hide in a cupboard or 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 subtract the number from first number i.e 78341-23= 78318
Your friend then crosses out one digit from the answer ( It cant be any digit except zero) e.g 7 X 318.
Your friend then reads out what digits are left e.g 7-3-1-8
Even though you have not seen the number you can say what missing digit is! Eight

The secret:

The great trick relies on the power of 9
After your friend has added up the digits and subtracted them the answer will always be dividable by 9.
If a number which divides on 9 when you add the digits of that number They will also divide by 9 .
If you check example 7+8+3+1+8=27  which does divide by nine
When your friend crosses a digit 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 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 one eight.
This is the number that was crossed out. 

The Missing Digit Math Trick in Urdu


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