How do I find the reciprocal of a number - Sharp el-531x scientific calculator

Use the key x-1.
Example: reciprocal of 5: Press 5, then key x-1, then =

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To find the reciprocal of a number, you put 1 divided by the number. In this case, it would be 1 divided by 34.

(mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2; the multiplicative inverse of 7 is 1/7
The reciprocal of a number is the quotient obtained by dividing one by the number. Thus the reciprocal of 8 is 1/8. Applied to fractions the above operation is carried out by simply inverting the fraction. Thus the reciprocal of 3/4 is 4/3 or 1-1/3.
As if math wasn't hard enough without this, huh?
I hope this was of some help to you. Good luck,
Bill

By definition, the reciprocal of a number is the number divided into one. Thus the product of a number and its reciprocal is one (1).

To calculate the inverse of a number one does as follows.
Non-scientific calculator: enter 1/ number the =
Scientific calculator: use the reciprocal key marked [x^-1] or [1/x]
The key, if it exists may be accessed directly (by pressing it), or after pressing the [SHIFT], [2nd ] or [2ndF] key. For the reciprocal key the number must already appear in the display screen.

Your question is not clear. To calculate the reciprocal of a number on display use the x^-1 or 1/x key, or just enter 1/ number.

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To calculate the reciprocal of a numerical value you can use

1. 1 / numerical value or
   
2. use the key sequence [SHIFT] [ ) ] (X to -1), if the number is already displayed (stored in answer Ans memory)

Example: calculate the reciprocal of 13. Must be in Run Mode

1 [/] 13 [EXE] result is 0.07692307692 or

13 [EXE] to have 13 in Ans memory (displayed) and [SHIFT][ ) ] [X to -1] [EXE].

For such a simple number as 13, calculating its reciprocal the second way seems ridiculous, but if the number is already displayed the second method is the only efficient one if you do not want to copy the result on a piece of paper and retype so as to calculate its reciprocal.

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