hi sir pls suggest me simpel method of solveing this type of questioihns

Which is the biggest perfect square amongst the
following:-

15129, 12348, 23716, 20736

2 answers

Enter the number in your calculator and press the square root sign.

You can also enter
square root 15129
into the Google search box.
sir i need to do with out calculator............it is an exam problem so plz suggest me any other method