KARA, Fatma; INCIKABI, Lutfi. Sixth Grade Students' Skills of Using Multiple Representations in Addition and Subtraction Operations in Fractions. International Electronic Journal of Elementary Education, [S.l.], v. 10, n. 4, p. 463-474, apr. 2018. ISSN 1307-9298. Available at: <https://iejee.com/index.php/IEJEE/article/view/462>. Date accessed: 18 july 2019.