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# What does the S<=>D button stand for? watch

1. Hi all

The Casio range has a button marked S<=>D. This is a toggle between decimal (D) and standard (S) form (fraction, pi).

What does the button actually stand for? So why choose S<=>D?

Someone said it is standard deviation but that is a measure of how far the numbers are spread out .

Thanks
2. It gives a decimal approximation.
3. (Original post by ODES_PDES)
It gives a decimal approximation.
thanks but I'm after why they use S<=>D.
4. (Original post by marcus888)
thanks but I'm after why they use S<=>D.
D = decimal
S = standard
5. On mine it's F>D meaning fraction to decimal.
6. (Original post by rayquaza17)
D = decimal
S = standard
Ah

Thanks
7. (Original post by marcus888)
Hi all

The Casio range has a button marked S<=>D. This is a toggle between decimal (D) and standard (S) form (fraction, pi).

What does the button actually stand for? So why choose S<=>D?

Someone said it is standard deviation but that is a measure of how far the numbers are spread out .

Thanks
Surd/standard to decimal

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Updated: March 23, 2016
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