Hi everyone, although I am able to solve some very advanced maths, I think I still have lots of basic concepts that I am still not clear. It is the

first day I am here so I 'd like to take this chance to ask.

Back to the roots... what is L.C.M. and what is H.C.F.?

and what is the H.C.F. of

16ab and 24a^2

another question is :

how many methods to divide a polynomials in x by another polynomials in x?

and what are the methods? I really forget these things

By the way, is there any websites that explain some general concepts like the above? Because I have become a mathematics teacher recently, I hope to review some resources to help me recall some simple concepts and learn the way to explain to my students

Thanks all