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Joke Torbeyns Bert De Smedt Pol Ghesquière Lieven Verschaffel 《Educational Studies in Mathematics》2009,71(1):1-17
This study aimed at analysing traditionally taught children’s acquisition and use of shortcut strategies in the number domain
20–100. One-hundred-ninety-five second, third, and fourth graders of different mathematical achievement levels participated
in the study. They were administered two tasks, both consisting of a series of two-digit additions and subtractions that maximally
elicit the use of the compensation and indirect addition strategy (, so the answer is 2 + 1 or 3). In the first task, children were instructed to solve all items as accurately and as fast as
possible with their preferred strategy. The second task was to generate at least two different strategies for each item. Results
demonstrated that children of all grades and all achievement levels hardly applied the compensation and indirect addition
strategy in the first task. Children’s strategy reports in the second task revealed that younger and lower achieving children
did not apply these strategies because they did not (yet) discover these strategies. By contrast, older and higher achieving
children appeared to have acquired these strategies by themselves. Results are interpreted in relation to cognitive psychological
and socio-cultural perspectives on children’s mathematics learning.
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Joseph P. Allen Meghan A. Costello Amanda F. Hellwig Corey Pettit Jessica A. Stern Bert N. Uchino 《Child development》2023,94(6):1610-1624
Adolescent success providing satisfying support in response to a close friend's call in a caregiving task was examined as a potentially fundamental developmental competence likely to predict future social functioning, adult caregiving security, and physical health. Adolescents (86 males, 98 females; 58% White, 29% African American, 8% mixed race/ethnicity, 5% other) were followed from ages 13 to 33 (1998–2021) using multiple methods and reporters. Early caregiving success was found to predict greater self- and partner-reported caregiving security, lower negativity in adult relationships, and higher adult vagal tone. Results are interpreted as advancing our understanding beyond simply recognizing that adolescent friendships have long-term import, to now identifying specific capacities within friendships that are linked to longer-term outcomes. 相似文献