− | |[http://www.textbooksonline.tn.nic.in/Books/Std08/Std08-I-MSSS-EM-1.pdf Tamilnadu Textbook Class - VIII - Chapter - 1 - Real numbers] | + | |[http://www.textbooksonline.tn.nic.in/Books/Std08/Std08-I-MSSS-EM-1.pdf Tamilnadu Textbook Class - VIII - Chapter - 1 - Real numbers Page No 2-55] |