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My exam book is telling me the calculator should have a 1/x button, or a x-1 button but none of the online ones do. My one does but the battery died and new one not arriving - I am behind due. Is there an equivalent button I am missing.

 Mar 1, 2019
 #1
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The online calculator at https://www.calculator.net/ has a 1/x button.

 

Alternatively, use an xy button (as on the webcalc calculator on the home page) with y as -1.

 Mar 1, 2019
 #2
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Does the calculator you tried have a 2nd Function button?  If so, see if that will give you the 1/x function. 

 Mar 1, 2019

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