Easier way of optimizing the perimeter of a rectangle?

Question

Is there an easier way to determine the perimter other than having to do long form way?
Area is fixed at 24m(squared)
I know A=LxW and P=2(LxW)
Length Width Area Perimeter
L=24 W= 1 A= 24 P= 50
L=12 W= 2 A= 24
L= 8 W= 3 A= 24
L= 6 W= 4 A= 24
Only long way I know to perimeter is
P=2(LxW)
=2(12+2)
=2 (14)
P=28m

I need a simple multiplication instead of having to do all the long form to obtain the perimeter

Thanks. Crazy teach wouldnt tell us that..maiking us do it all out in long form. shesh

Answer 1

add the length and the width and do a simple multiplication with 2
it is fairly simple though with three unnecessary steps it is made to appear complicated

Answer 2

Making addition takes less time than multiplication.
To find the perimeter add all sides P=L+W+L+W

But don't forget. The idea of your teacher is to teach you a way which can be understandable by everyone.