We are a group of scientists and math Curriculum developers, some of us have been working in teaching math in elementary school for 12 years and more,
we worked together to develop a new method for teaching math, a brain based method.
We argue that, for children, learning mathematics is more efficient when it relies, more on the visual-spatial system rather than on an immature formal language system in the brain. In fact, relying heavily on the formal language system can cause mathematics anxiety when learning mathematics, which in turn, decrease a student's ability to learn mathematics effectively.
The problem is most mathematics curriculum teach the subject matter using mostly formal language, making the process inversely beneficial for children training to learn mathematics at such a young age, when their formal language systems have yet to mature.