e to a power, and the natural logarithm
The function is the yellow label above the ln key. For this example, ask for three significant digits: press 
, 
, 
for Sci, and 
. Calculate . Press and 
, and type the exponent 5. Press 
to leave the exponent, then 
, type 2, and 
: 2.97×10|^:2, which is 297. The natural logarithm is the ln key itself: press 
, type 90, 
, and : 4.50×10|^:0, or 4.50. Return to the normal number format: press , , 
, and 
.