Exceljet

Quick, clean, and to the point

Apply scientific format

Windows shortcut 
CtrlShift^
Mac shortcut 
^

Apply the Scientific number format with two decimal places.

Your videos are the best one I have seen so far. I use excel in my advanced acc. techniques course and may be coming back to you for some tailored chosen set of videos. - Joanna
Excel foundational video course
Excel Pivot Table video training course
Excel conditional formatting video course
Excel formulas and functions video training course
Excel Shortcuts Video Course