« previous next »
Pages: 1 [2]   Go Down

Author Topic: Amazing Mental Maths!  (Read 9809 times)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: amazing mental maths
« Reply #15 on: September 25, 2009, 11:59:20 am »
y doesnt the division symbol come up in the latex text..

i cud put the square root thingy though
Logged
divine intervention!

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: amazing mental maths
« Reply #16 on: September 25, 2009, 12:37:09 pm »
To do x divided by y in latex type \frac {x}{y}
Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: amazing mental maths
« Reply #17 on: September 25, 2009, 12:50:19 pm »
 sqrt6
know root close to 6 = 9

the formula

known root  - \frac {known square - unknown square}{2*known square root} 

known root = 3 (of 9)

known square = 9
unknown square = 6

so...

 answer ==> 2.5
Logged
divine intervention!

nid404

  • Guest
Re: amazing mental maths
« Reply #18 on: September 27, 2009, 06:57:09 am »
How do you get it in 6 d.p ......I wanna know to do it in 30 seconds....
Logged

Offline Saladin

  • The Samurai
  • Honorary Member
  • SF V.I.P
  • *****
  • Posts: 6530
  • Reputation: 59719
  • Gender: Male
  • I believe in those who believe in me
    • Student Tech
Re: amazing mental maths
« Reply #19 on: September 29, 2009, 07:07:17 am »
Experience, practice and brains.
Logged

nid404

  • Guest
Re: amazing mental maths
« Reply #20 on: September 29, 2009, 07:38:35 am »
I know...I wanna start practicing...so how??
Logged
Pages: 1 [2]   Go Up
« previous next »