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Author Topic: Amazing Mental Maths!  (Read 9638 times)

Offline Ghost Of Highbury

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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
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Offline astarmathsandphysics

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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}
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Offline Ghost Of Highbury

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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
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nid404

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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....
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Offline Saladin

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Re: amazing mental maths
« Reply #19 on: September 29, 2009, 07:07:17 am »
Experience, practice and brains.
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nid404

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Re: amazing mental maths
« Reply #20 on: September 29, 2009, 07:38:35 am »
I know...I wanna start practicing...so how??
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