To the nearest hundredth, how many cm are in 16 in? (1 in = 2.54 cm)

Well ok all you need to do is multiply 2.54 and 16 then round.

                                   2.54
                                  x  16
                                   
                                  1524
                                +2540
                               
                             → 40.64 ←
This answer is already rounded to the nearest hundredth. I hope this helps love! :)