1. Acar, N. (2010). The effect of fraction rulers on the addition and subtraction of fraction abilities of 6th grade students of elementary school (Master’s Thesis). Available from Council of Higher Education Thesis Center Database in Turkey. (Thesis No. 251433).
2. Akın, P. (2009). The effects of problem-based learning on students? Success in the teaching the topic fractions at the 5th grade. (Master’s Thesis). Available from Council of Higher Education Thesis Center Database in Turkey. (Thesis No. 241307).
3. Clements, D. H., Sarama, J., & DiBiase, A. M. (Eds.). (2004). Engaging young children in mathematics: Standards for early childhood mathematics education. Routledge.
4. Demirdöğen, N. (2007). The effect of realistic mathematics education method to the teaching fraction concept in 6th classes of primary education. (Master’s Thesis). Available from Council of Higher Education Thesis Center Database in Turkey. (Thesis No. 207129).
5. Erdağ, S. (2011). The effect of mathematics teaching supported by concepts cartoons decimal fractions on academic achievement and retention in 5th grade classes of primary schools. (Master’s Thesis). Available from Council of Higher Education Thesis Center Database in Turkey. (Thesis No. 296499).