**Biography**

I did my BSc in Electrical Engineering, in Iran. In 1999, I moved to Canada, worked at Nortel Networks for six years, then switch career to become a teacher, and did my BEd at University of Windsor. In 2006, I did my MEd at the University of Ottawa, then taught mathematics and physics at a school designed for students with dyslexia. In 2011, I started to work as a part time professor at University of Ottawa, where in 2013 I started my doctoral study, under the supervision of Dr. Barwell.

**Research Interest **

I am interested in “things kids think with”; that is tools that kids interact with to learn mathematics. My research looks at tools, both ones that are designed in such a way that carry mathematical meanings, such as an abacus, and ones that are not necessary designed that way, such as an apple or a piece of paper. To analyse children’s interactions with these tools, I look at both children’s perception and the physical properties of the tools. I also am interested in environmental issues as they relate to learning of mathematics.

**Publications **

- Abtahi, Y. (2014) Who/what is the more knowledgeable other?
*For the Learning of Mathematic, 34*(3) 14-15. - Abtahi, Y. (2015). The Zone of Proximal development and the affordances of the mathematical tools. Beswick, K., Muir, T., & Wells, J. (Eds.) (2015).
*Proceedings of the 39th Conference of the International Group for the Psychology of Mathematics Education,*2, 1-9. Hobart, Australia: PME. - Abtahi, Y. (2015). 2/5 + 1/6 = 9.8/24: Rulers, tapes, and Fractions. Adhoc presented at the Canadian Mathematics Education Study Group (CMESG), Moncton, NB, June.
- Abtahi, Y. (2015). Recursive-ness: Using manipulatives to understand fractions and using fractions to understand manipulatives. Paper presented at Canadian Society for the Study of Education (CSSE), Ottawa, Canada, May.
- Abtahi, Y. (2015). Which one is the 1/7? Paper will be presented at Fields Mathematics Education Forum (FIELD), presented, Toronto, ON, January.
- Abtahi, Y. (2014) Feedback from mathematical artefacts. Paper presented at the Psychology of Mathematics Education (PME), Vancouver, BC, July.
- Abtahi, Y. (2014) Which Rod? Units & the Addition of Fractions. Paper presented at the Canadian Mathematics Education Forum (CMEF), Ottawa, ON, May.