Continue from the last answer
Press 
, type 6, press 
, type 4 and press 
: 10.. Press , type 5 and press : the calculator continues from 10, so the answer is 15.. Type 8, press 
, type 2 and press : 16.. Press 
and : the answer is squared, 256.. Type 44, press , type 37 and press : 81.. Press 
and then : the square root of the last answer is 9..