Concrete - Representational - Abstract
It is how our mind works!
Ever wonder why your students don't know the why behind division, exponents or fractions? It could be that they cannot SEE what is happening which makes concepts out-of-reach.
Check out the CRA process in the video below, and while you are there, think about the vertical and horizontal alignment of the math standards.
Visit Research-Based Education and Strategies for explanations, steps to take, examples, and benefits.
Try it for a month and you won't regret it.