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 https://www.youtube.com/watch?v=Lx27Ns1-tmU
and watch this https://www.youtube.com/watch?v=ORghWH64MH0 to know both Rational and Irrational Square roots together.
Also watch https://www.youtube.com/watch?v=P0hCnWurM6g 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
https://www.youtube.com/watch?v=HEytekuiY1Y
https://www.youtube.com/watch?v=mZhtZGQGA-U
Hope this helps