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Direct linkThompson, Clarissa A.; Opfer, John E. – Child Development, 2010
How does understanding the decimal system change with age and experience? Second, third, sixth graders, and adults (Experiment 1: N = 96, mean ages = 7.9, 9.23, 12.06, and 19.96 years, respectively) made number line estimates across 3 scales (0-1,000, 0-10,000, and 0-100,000). Generation of linear estimates increased with age but decreased with…
Descriptors: Experimental Groups, Grade 6, Grade 2, Age Differences
Lipton, Jennifer S.; Spelke, Elizabeth S. – Child Development, 2005
Five-year-old children categorized as skilled versus unskilled counters were given verbal estimation and number word comprehension tasks with numerosities 20-120. Skilled counters showed a linear relation between number words and nonsymbolic numerosities. Unskilled counters showed the same linear relation for smaller numbers to which they could…
Descriptors: Preschool Children, Numbers, Cognitive Mapping, Task Analysis
