Question 7933
 1)Is it always possible using the elementary row operations for matrices to transform any square matrix into echelon form with all 1's along its main diagonal? 

 Ans: No unless the given matrix is a square and invertible matrix.
 [It seems that you even do know what is an identity matrix. It is
  so sad. ]

2)Can you take any two matrices and add them, subtract them and multiply them together? 
 Sol: If the two matrices are exacly the same order then we can add them, 
  and subtract them.
 Let matrice A be of order p x q and B be of s x t  ,if q = s then
 AB is well-defined otherwise the product is undefined.
3) Is it possible to divide two matrices?
 Ans:
If A is of order m x n  and B is of order n x n, also if B is invertible
  then we can define A/B by AB^-1

 Anyway, you have to work hard. Don't rely on other persons.

 Knowledge is for your own benefit.

 Kenny