ยศสิริพิมล ภ. , แหยมแสง ว. , แหยมแสง น. and หาดแก้ว ภ. 2020. The Effects of Mathematics Learning Activities on Fractions Based on the Constructivism Theory on Matthayom Sueksa One Students. Ramkhamhaeng Research Journal of Humanities and Social Science. 23, 2 (Dec. 2020), 1–15.