Don’t be a Mathematician, Be a Mathemagician


We all like to impress others. It is a natural tendency. In this page I will share certain maths tricks with you (which I learnt from Benjamin and Shermer), which you can use to impress your family members, friends, colleagues or acquaintances. They will be swept off their feet when you do this. So get ready to be in the limelight.  Become a mathemagician.

Trick 1

How to MENTALLY multiply any two-digit number by 11

Simply add the two digits and insert the sum in between the two-digits.

Example:

32 * 11

3 + 2 = 5

So, the answer is 352

(multiply the conventional way and check for yourself)

Note:

As long, as the sum is in single digit, the method remains the same.

But if the sum of the given two-digit number is in two-digits: For example:

85*11

8 + 5 = 13

Then your answer will not be 8135.   

In this case insert 3 in between 8 and 5 and add 1 to 8, so the answer will be 935.


Another example:

59 * 11 will be

5 + 9 = 14

Insert 4 in between 5 and 9 and add 1 to 5.

So, the answer will be 649


Got it!

Trick 2

How to MENTALLY square a two-digit number that ends with 5

Just remember two rules:

1.      Multiply the first digit by the next higher digit

2.    Attach 25  

Example:

45*45

Multiply 4 by 5 (which is 20)

Attach 25 to 20, the answer is 2025

Another example

65 * 65

Multiply 6 by 7 (which is 42)

Attach 25 to 42, the answer is 4225

(check the conventional way and see).


All the best for becoming mathemagicans.     



-          NZ

31.5.2019

Comments

  1. Shakeel31 May 2019 at 07:28

    MATHS stands for Mentally Affected Teachers Harassing Students.....On the Lighter Note.....🙂🙂

    ReplyDelete

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