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Yes !! I do not need a calculator :)

Question asked by Karishma Manwani in #Coffee Room on Feb 12, 2014
Karishma Manwani
Karishma Manwani 路 Feb 12, 2014
Rank D1 - MASTER
I did not know that multiplying with 11 was this easy !
I came across a trick to multiply numbers with 11 and come up with your answer before the calculator .

For example : 32 * 11 [For numbers which add up to less than equal to 9]
Just add the two digits : 3+2=5 and place it in between the original number 32 and tada 352 is your answer 😀

99*11[Numbers which add up to a number greater than 9]
Add: 9+9=18
You again need to put this 18 in the middle of the original number but You have to add the 10s place number(obtained after addition) to the 1st digit of the original number .
(9+1)89 i.e 1089 is your answer

77*11

Answer : 847
Explanation : 7+7 = 14
Putting it in the middle : 7147
But you have to add 1 to 7 for the answer : (7+1)47 = 847

Start with this 2 digit number multiplication with 11 and display the MATHEMAGICIAN in you to your friends ! Enjoy 😀 Posted in: #Coffee Room
Bionic
Bionic 路 Mar 11, 2014
Rank D1 - MASTER
56*11=(5+1)16=616..
Bionic
Bionic 路 Mar 11, 2014
Rank D1 - MASTER
67*11=(6+1)37=737...
Bionic
Bionic 路 Mar 11, 2014
Rank D1 - MASTER
34*11=(3(3+4)4)=374
smorgasbord
smorgasbord 路 Apr 18, 2014
Rank D2 - MASTER
you could do a lot more than that with Vedic maths
Karthikeyan jaisankar
Karthikeyan jaisankar 路 Jun 28, 2014
Rank C3 - EXPERT
47*11= (4+7)
=4117
=(4+1)17
=517 i got it"!!! 馃榾
Ramani Aswath
Ramani Aswath 路 Jun 29, 2014
Rank A1 - PRO
The Trachtenberg Speed System of Basic Mathematics book was available in the IIT Madras library in 1962. Later I bought it and went through all of it. I still use the techniques when applicable.

Multiplication by 11 (any number of digits) is done by a process called add the neighbour. What is shown above is a special case of this.

The book is now available for free download.

https://www.scribd.com/doc/6422182/The-Trachtenberg-Speed-System-of-Basic-Mathematics

Also from here:

https://www.speed-math.com/download.htm

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