There is some evidence to suggest (and it makes logical sense) that the numerical concepts children acquire in early childhood lay the foundation for learning mathematical concepts. And professional wisdom tells us that successful early experiences in math have a powerful effect on the interest and confidence students bring to new opportunities for math learning.
We believe that providing carefully tailored individual or small group instruction together with additional practice, explanation and feedback might be sufficient for many students who are lagging behind their peers in learning critical foundational skills in math. While there are surely students whose underlying struggles in math learning are due to learning disabilities, tailoring math instruction in the early years will benefit all children.