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 2 years ago
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Tutorial 3: Math tricks(contd.)
Hope you like my tutorial series,Do provide you feedback .You can get the previous ones @http://openstudy.com/users/aravindg
 2 years ago
Note :This is not a question !! Tutorial 3: Math tricks(contd.) Hope you like my tutorial series,Do provide you feedback .You can get the previous ones @http://openstudy.com/users/aravindg

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AravindG
 2 years ago
Best ResponseYou've already chosen the best response.8This trick is much famous but still I would like to add it to the series Multiplication of 11 with any number. (You can't use this rule for other numbers) _________________________________________________________________________ Let me explain this rule by taking examples 1) 234163*11 = 22+33+44+11+66+33 = 2575793 Means insert the sum of 2 successive digits and put 2 terminal digits in its place 2) 45345181*11 = 44+55+33+44+55+11+88+11 = 498796991 Here an extra case arises Consider the following examples for that 3) 473927*11 = 4+1 (4+710) +1 (7+310) +1 (3+910) +1 (9+210) (2+7) 7 = 5213197 4) 584536*11 = 5+1(5+810)+1(8+410)(4+5)(5+3)(3+6)6 = 6429896

AravindG
 2 years ago
Best ResponseYou've already chosen the best response.8And an additional one for those who knew it already (i dont want to dissappoint anyone :) ) Multiplication of 5 with any number (You can't use this rule for other numbers) _______________________________________________________________________ Let me explain this rule by taking examples 1. 49*5 = 490/2 = 245. 2. 453*5 = 4530/2 = 2265. Understand the rule by 1 more example 5649*5 = 56490/2 = 28245.

AravindG
 2 years ago
Best ResponseYou've already chosen the best response.8>>my tutorials are published on a daily basis .hope you enjoy these tricks !

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.1Might be worthwhile to point out why multiplying by 5 like that works: Because 5 is half of 10.

CliffSedge
 2 years ago
Best ResponseYou've already chosen the best response.1And the multiplication by 11 might make more sense if you start small, like with a twodigit number. ex.1. 63 × 11 = 6 _ 3. In the _ goes (6+3). 63 × 11 = 693. Note that there is room in the _ only for a one digit number. 78 × 11 = 7 _ 8. In the _ goes (7+8), but there is only room for the 5, so carry the 1. 78 × 11 = 858. Doing the reverse of this process can also let you tell if a number is divisible by 11. ;)

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1@AravindG what reference are you using for this tutorials ? i have learned these exact tricks years ago from a book.

geoffb
 2 years ago
Best ResponseYou've already chosen the best response.0There's an app for Mac computers called Mathemagics. It has tons of tricks like this.

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1O.o any windows or linux counterpart ?

geoffb
 2 years ago
Best ResponseYou've already chosen the best response.0Not sure. I searched it, and it's available on the iPhone, too (which is a bit more ubiquitous). http://www.bluelightninglabs.com/apps/mathemagics

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1same trick can be applied when multiplied by 111. just take three consecutive digits sum also. example : 431 * 111 = 4 4+34+3+13+11 = 47841 15344 *111 = 1(1+5)+1(1+5+310)+1(5+3+410)+1 (3+4+410)(4+4)4 = 1703184 and same for 1111 , 11111 and so on.

AravindG
 2 years ago
Best ResponseYou've already chosen the best response.8@CiffSedge thanks for adding that to the tutuorial :) @hartnn its from a Indian book entitled "Vedic mathematics"

hartnn
 2 years ago
Best ResponseYou've already chosen the best response.1i used 'Vedic Maths made Easy' by Dhaval Bhatia

AravindG
 2 years ago
Best ResponseYou've already chosen the best response.8i see ... then its not surprising that you have seen these tricks before ! most math tricks are got from vedic texts as they encouraged mental thinking than blind working even from ancient time !
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