Learn to find the square root by division method. Here's a link of how to find square root of irrational numbers by division method in Hindi    • Finding Square Root by Division Metho...  

and watch this    • Find Square roots of any number by Lo...   to know both Rational and Irrational Square roots together.

Also watch    • The Logic behind finding the square r...   to know why the method works.

I use iBall pen tablet (pen digitizer) to write. The softwares are Microsoft Onenote as a whiteboard, Camtasia Recorder to record the screen.

Watch these videos to get a better idea

   • पढ़ाई वाले Video कैसे बनायें , How to ...  


   • How To Write on Screen | Wacom Pen Ta...  

Hope this helps