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## Howto Convert 0.4082482905 To 1/sqrt(6) ?

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Junior Member
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Joined: Sun Mar 03, 2013 7:35 am
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### Howto Convert 0.4082482905 To 1/sqrt(6) ?

As you know, 1/sqrt(6) = 0.4082482905

How can I convert 0.4082482905 back to 1/sqrt(6) ? (assuming I do not know 1/sqrt(6))
using casio calculators, fx 9850 or similar ? (using either a program, addin or similar.)

Because, sometime, I find these numbers as result of calculations, however, these should be shortened...

or, similarly, 1/sqrt(3)

Senior Member
Posts: 369
Joined: Tue Jan 03, 2012 11:24 pm
Calculators: Casio Afx 1.0, Casio fx-9860GII SD, Casio Classpad 330, Casio fx-CG20, Casio Classpad fx-CP400

### Re: Howto Convert 0.4082482905 To 1/sqrt(6) ?

Convert 0.4082482905 back to 1/sqrt(6) (currently) is impossible.

During calculations, you can work with the exact value using the key [F<->D].

EDITED:
Casio Calculators give an approximate value:
1/sqrt(6)=0.4082482905

The (more) exact value (approximate) should be:
1/sqrt(6)≈0.40824829046386

So it is normal that the calculator does not recognize this value as a fraction. Maybe calculator only accept 10 decimal digits.

The site wolframalpha can discover the original value: http://www.wolframalpha.com/input/?i=0.4082482905
SiO2 + CaCO3 ----------> CaSiO3 + CO2

Member
Posts: 43
Joined: Thu May 31, 2012 5:45 pm
Location: Greece
Calculators: Casio fx-9860G SD

### Re: Howto Convert 0.4082482905 To 1/sqrt(6) ?

it is not impossible and many algorithms exist for this.
But all are approximations.
you can see for example the RIES algorithm:
http://mrob.com/pub/ries/index-2.html#algorithm
So to make this on calculator, you have to write an analogous code to the calculator as an addin.

Junior Member
Posts: 6
Joined: Sun Mar 03, 2013 11:40 pm
Calculators: Casio fx-9860G SD, Casio fx-CG20

### Re: Howto Convert 0.4082482905 To 1/sqrt(6) ?

Calculator only supports 10 decimals:
0.9999999999 = 0.9999999999
0.99999999999 = 1

Posts: 89
Joined: Thu Apr 05, 2012 3:16 pm
Location: Akron, OH, USA
Calculators: Casio fx-9750GII, Casio fx-CG10

### Re: Howto Convert 0.4082482905 To 1/sqrt(6) ?

Arkhs is correct, only 10 digits are supported by the calculator. This is stated in the manual.