Recall that e is an irrational number (e is approximately equal to 2.718281828...) and lnx is the natural logarithm associated with e (that is the natural log has the base of e).  

Enter e⁴ into the calculator.  The base is e and the exponent is 4.

Step 1: Enter e.   Press the yellow 2nd button, then  ex located in yellow above the LN button (two buttons above ON). Notice that the e, the karat ^, and the left parenthesis show up on screen.

Step 2: Enter the exponent. In this example, it would be 4
Step 3: Enter the right parenthesis.
Step 4: Press ENTER.  The answer will show up on the right side of the screen.

Similarly we can evaluate a natural log.  For example, evaluate ln(5).

Step 1: Enter ln.   Press the LN button (two buttons above ON). Notice that the ln and the left parenthesis show up on screen.

Step 2: Enter 5, then enter the right parenthesis.

Step 3: Press ENTER.  The answer will show up on the right side of the screen.

 

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This site was last updated 08/16/02 and is maintained by Donna L. Sperry