“…Some children are highly proficient at numeracy skills such as counting from the outset of school, yet others have further to go to reach the same level of competency as their counterparts (Case, Griffin, & Kelly, 2001). For instance, Starkey and Klein (2000), reported in Ginsburg, Choy, Lopez, Netley, and Chao-Yuan (1997) found striking differences between low-and middle-income preschoolers in their ability to count objects, solve conservation problems, add with objects, and compare the sizes of numbers presented orally. Other studies comparing low-and middle-income children (Griffin, Case, & Siegler, 1994;Jordan, Huttenlocher, & Levine, 1992;Kirk, Hunt, & Volkmar, 1975) as well as cross-cultural comparisons of early counting and arithmetic abilities (e.g., Geary, Bow-Thomas, Liu, & Siegler, 1996) suggest that differences in the amount or types of experiences children have with number during the preschool years may underlie differences in early counting and other numeracy skills.…”