@article{oai:phoenix.repo.nii.ac.jp:00000582,
 author = {栗山, 和広 and クリヤマ, カズヒロ and KURIYAMA, Kazuhiro},
 journal = {九州保健福祉大学研究紀要, Journal of Kyushu University of Health and Welfare},
 month = {Mar},
 note = {P(論文), The purpose of this study was to examine children's difiiculty of identifying underlying components in ratio problems. One hundred and forty nine fifth graders solved three problems of ratio concepts. Three ratio word problems composed of the first term of proportion (p=a÷b;p:proportion, a:quantity to be compared, b@base quantity) , the second term of proportion (b*p=a), the third term of proportion (b=a÷p). As results, it was very difficult for children to solve correctly the first term of proportion, the second term of proprotion, and the third term of proportion, Furthermore, strategies showed that the most frequently selected equation was small number ÷ bigger number in the first term of proportion, in the term of proportion most of children selected division type although the correct equation was multiplication, and in the third term of proportion almost all of children selecte multiplication type. These results suggested that children's difficulties of identigying omponents was one of the main factors related the difficulty of ratio problems.},
 pages = {35--40},
 title = {割合概念における認知的障害},
 volume = {6},
 year = {2005},
 yomi = {クリヤマ, カズヒロ}
}