1- [tex]\sqrt{156}[/tex]
156 lies between 144 and 169
So [tex]\sqrt{156}[/tex] lies between 12 and 13.
2- [tex]\sqrt{320}[/tex]
320 lies between 289 and 324.
So [tex]\sqrt{320}[/tex] lies between 17 and 18.
3- [tex]\sqrt{249}[/tex]
249 lies between 225 and 256
So [tex]\sqrt{249}[/tex] lies between 15 and 16.
