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Reciprocal

On a Casio calculator you can obtain the reciprocal of a number with the key

x-1

 


Example 1

To calculate the reciprocal of 2 as 2−1 = 0.5

 2  x-1 =  2-1
         0.5

or with a negative exponent as 2−1 = 0.5

 2   1  =  2−1
         0.5

or as the division 1 ÷ 2 = 0.5

 1  ÷  2  =  1÷2
         0.5

or as the fraction 1 / 2 = 0.5

 1  a b/c  2  =  12
         12.
a b/c  12
         0.5

 


Example 2

To calculate  = 0.707107

   2  x-1 =  √2-1
 0.707106781

but you can also enter this as

 2   1  =  √2−1
 0.707106781

and because  also as

 1  ÷  2  =  1÷√2
 0.707106781

 


Example 3

Enter 0−1

 0  x-1 = Math ERROR 
 

Dividing by zero always produces a message, and that is correct.

 


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