....Children who lag behind in math during early childhood often experience later mathematical difficulties, according to a recent study published in Researchers noted that children who start school with a poor understanding of numerals are four times more likely than their peers to struggle with employment-relevant math by the time they reach adolescence......
Comments: For more information about math and estimation, see:
Fischer B, Köngeter A, Hartnegg K. Effects of Daily Practice on Subitizing, Visual Counting, and Basic Arithmetic Skills. Optom Vis Dev 2008:39(1):30-34
Fischer B, Gebhardt C, Hartnegg K. Subitizing and Visual Counting in Children with Problems in Acquiring Basic Arithmetic Skills. Optom Vis Dev 2008:39(1):24-29.