Presenting a problem and developing the skills needed to solve that problem is more motivational than teaching the skills without a context.
For example, drawing out a square when the problem is asking you to solve the unknown length of one of the sides or the length between opposite corners allows you to visualize what you are solving and how to go about it.
Write other known information about the object, such as the width of the square, beside the object to better understand what is being asked of you and what information you already have.
Let us consider how problem solving is a useful medium for each of these.
It has already been pointed out that mathematics is an essential discipline because of its practical role to the individual and society.