Trick of the Day - Things to memorize

Go down

Trick of the Day - Things to memorize

Post by Ani on Wed Mar 11, 2009 4:26 pm

This website contains a ton of tricks:
math-magic.com


Today's trick is not a trick, but a list of facts that one must memorize to improve one's score:

1. 67*67 = 4489
667*667 = 444889
6667*6667 = 44448889
and so on...

2. 1*9 + 2 = 11
12*9 + 3 = 111
123 * 9 + 4 = 1111
and so on...

3. 1*8 + 1 = 9
12*8 + 2 = 98
123*8 + 3 = 987
and so on...

Any more anyone can think of?

squares
cubes
Factorials
avatar
Ani
Vice-President
Vice-President

Male Number of posts : 236
Age : 25
Location : Kanto
Registration date : 2008-05-02

View user profile

Back to top Go down

Re: Trick of the Day - Things to memorize

Post by Alex Tatge on Wed Mar 11, 2009 7:13 pm

also

1*9 +2 = 11
12* 9 +3 = 111
123*9 + 4 = 1111

So on...
avatar
Alex Tatge
Webmaster
Webmaster

Male Number of posts : 58
Location : In yore base, killing yore d00ds.
Registration date : 2008-09-22

View user profile http://fmylife.com

Back to top Go down

Re: Trick of the Day - Things to memorize

Post by Alex Tatge on Wed Mar 11, 2009 7:14 pm

As well as some things to remember--

(x)^2 + (3x)^2
is the same thing as 10 * (x)^2
some people dont know this, so just throwing it out there.
avatar
Alex Tatge
Webmaster
Webmaster

Male Number of posts : 58
Location : In yore base, killing yore d00ds.
Registration date : 2008-09-22

View user profile http://fmylife.com

Back to top Go down

Re: Trick of the Day - Things to memorize

Post by Alex Tatge on Wed Mar 11, 2009 8:29 pm

And another.
Kinda simple, but REMEMBER YOUR TRIANGLES!!!
3-4-5
5-12-13
7-24-25
9-40-41
11-60-61
8-15-17

these are the most commonly used.
avatar
Alex Tatge
Webmaster
Webmaster

Male Number of posts : 58
Location : In yore base, killing yore d00ds.
Registration date : 2008-09-22

View user profile http://fmylife.com

Back to top Go down

Re: Trick of the Day - Things to memorize

Post by Ani on Wed Mar 11, 2009 9:10 pm

memorize cubes up to 17 at least:
1^3 = 1
2^3 = 8
3^3 = 27
4^3 = 64
5^3 = 125
6^3 = 216
7^3 = 343
8^3 = 512
9^3 = 729
10^3 = 1000
11^3 = 1331
12^3 = 1728
13^3 = 2197
14^3 = 2744
15^3 = 3375
16^3 = 4096
17^3 = 4913
avatar
Ani
Vice-President
Vice-President

Male Number of posts : 236
Age : 25
Location : Kanto
Registration date : 2008-05-02

View user profile

Back to top Go down

Re: Trick of the Day - Things to memorize

Post by Michael on Mon Mar 16, 2009 8:45 am

Coach Boyd taught (at least while I was there) to memorize squares up to 40 and cubes up to 25.

(I was lazy and did it in JavaScript. If anyone wants to post HTML or JavaScript, just let me know - only admins can).

_________________
Webmaster 08-09

Elkins Chess Club Website
avatar
Michael
Graduated member
Graduated member

Male Number of posts : 151
Age : 26
Registration date : 2008-04-30

View user profile http://elkinschess.forummotion.com

Back to top Go down

Re: Trick of the Day - Things to memorize

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum