|[http://www.textbooksonline.tn.nic.in/Books/Std09/Std09-III-Maths-TeM.pdf Scientific notation of real numbers and logarthims Page No 17-52] | |[http://www.textbooksonline.tn.nic.in/Books/Std09/Std09-III-Maths-TeM.pdf Scientific notation of real numbers and logarthims Page No 17-52] |