Publications

You can also check my profile in ResearchGate here

Paper publications in International Journals

Georgiades, V & Christou, K. P. (2021). Concept Mapping to Measure Mathematical Experts’ Number Sense. International Journal for Research in Mathematics Education, 10(3), 6-26. doi: https://doi.org/10.37001/ripem.v10i3.2619

Christou, K. P. & Vamvakoussi, X. (2021). Natural number bias on evaluations of the effect of multiplication and division: the role of the type of numbers. Mathematics Education Research Journal, doi: https://doi.org/10.1007/s13394-021-00398-3

Christou, K. P., Pollack, C., Van Hoof, J., & Van Dooren, W. (2020). Natural Number Bias in Arithmetic Operations With Missing Numbers–A Reaction Time Study. Journal of Numerical Cognition, 6(1), 22-49. doi: https://doi.org/10.5964/jnc.v6i1.228

Christou, K. P., & Prokopou, A. (2020). Using refutational text to address the Multiplication Makes Bigger misconception. Educational Journal of the University of Patras UNESCO Chair. 7(1), 125-140, doi: https://doi.org/10.26220/une.3210

Vamvakoussi, X., Christou, K. P., Vosniadou, S. (2018) Bridging psychological and educational research on rational number knowledge. Journal of Numerical Cognition, 2018, Vol. 4(1), 84–106, doi:10.5964/jnc.v4i1.82

Christou, K. P. (2017) Students’ interpretation of variables and the phenomenal sign of algebraic expressions, MENON: Journal of Educational Research, 4, 161-175.

Paper publications in Greek journal with review process

Δημητρακοπούλου, Σ. Α., & Χρήστου, Κ. Π. (2018). Τα γράμματα-μεταβλητές: Πώς τα κατανοούν οι μαθητές και πώς εμφανίζονται στα βιβλία Μαθηματικών του Γυμνασίου. Έρευνα στη Διδακτική των Μαθηματικών, 0(11), 31-52. doi:http://dx.doi.org/10.12681/enedim.18938

Λεμονή, Ι. & Χρήστου, Κ. Π. (2019). Στρατηγικές νοερού υπολογισμού σε πράξεις με ακεραίους. Περιοδικό «Νέοι Ερευνητές», της Ένωσης Ερευνητών Διδακτικής των Μαθηματικών (Εν.Ε.Δι.Μ), 13, 25-45 doi: http://dx.doi.org/10.12681/enedim.21965

Μαρής, Δ & Χρήστου, Κ. Π. (2019). Η Μαθηματική ιστορία ως εργαλείο για την κατανόηση των ρητών αριθμών. Περιοδικό «Νέοι Ερευνητές», της Ένωσης Ερευνητών Διδακτικής των Μαθηματικών (Εν.Ε.Δι.Μ), 13, 46-67 doi: http://dx.doi.org/10.12681/enedim.21967

Χρήστου, Κ. Π. (υπό έκδοση). Ο Πολλαπλασιασμός Πάντα Μεγαλώνει; Μια Περίπτωση Μάθησης με Εννοιολογική Αλλαγή στα Μαθηματικά. Περιοδικό Ψυχολογία.

Edited Books

Christou, K. P. & Eshach. H. (Eds.) (2016). Conceptual Change Meets Other Disciplines - Abstracts of the 10^th International Conference on Conceptual Change, Florina, Greece: UOWM

Christou, K. P. & Benke, G. (Eds.) (2018). Epistemic Cognition & Conceptual Change - Abstracts of the 11^th International Conference on Conceptual Change, Klagenfurt, Austria, University of Klagenfurt.

Publications in Conference Proceedings with Reviewing Process

Μαρής, Δ., & Χρήστου, Κ. Π. (2019) Η Μαθηματική Ιστορία ως Εργαλείο για την Κατανόηση των Ρητών Αριθμών. Πρακτικά 8ου Πανελλήνιου Συνεδρίου της Ένωσης Ερευνητών της Διδακτικής των Μαθηματικών: Μαθηματική Γνώση και Διδακτικές Πρακτικές. (σελ. υπό έκδοση). Λευκωσία: ΕΝΕΔΙΜ

Λεμονή, Ι., & Χρήστου, Κ. Π. (2019) Στρατηγικές Νοερού Υπολογισμού σε Πρόσθεση και Αφαίρεση με Ακέραιους. Πρακτικά 8ου Πανελλήνιου Συνεδρίου της Ένωσης Ερευνητών της Διδακτικής των Μαθηματικών: Μαθηματική Γνώση και Διδακτικές Πρακτικές. (σελ. υπό έκδοση). Λευκωσία: ΕΝΕΔΙΜ

Χαραλαμπάκης, Σ., & Χρήστου, Κ. Π. (2019) Μαθηματικό Άγχος: Μελέτη σε μελλοντικούς εκπαιδευτικούς της πρωτοβάθμιας εκπαίδευσης. Πρακτικά 8ου Πανελλήνιου Συνεδρίου της Ένωσης Ερευνητών της Διδακτικής των Μαθηματικών: Μαθηματική Γνώση και Διδακτικές Πρακτικές. (σελ. υπό έκδοση). Λευκωσία: ΕΝΕΔΙΜ

Χρήστου, Κ. Π., & Προκόπου, Α. (2019) Εφαρμογή Ανατρεπτικού Κειμένου για την Αντιμετώπιση της Παρανόησης ότι ο Πολλαπλασιασμός Μεγαλώνει. Πρακτικά 8ου Πανελλήνιου Συνεδρίου της Ένωσης Ερευνητών της Διδακτικής των Μαθηματικών: Μαθηματική Γνώση και Διδακτικές Πρακτικές. (σελ. υπό έκδοση). Λευκωσία: ΕΝΕΔΙΜ

Κούρτη, Σ. Κ., Τριανταφυλλάκος, Α., & Χρήστου, Κ. Π., (2018). Η προκατάληψη των φυσικών αριθμών ως διαισθητικός συλλογισμός – μια μελέτη της βεβαιότητας των μαθητών. Στο Θ. Ζαχαριάδης, Δ. Πόταρη, Γ. Ψυχάρης (επιμ.). Πρακτικά 7ου Πανελλήνιου Συνεδρίου της Ένωσης Ερευνητών της Διδακτικής των Μαθηματικών: Μαθηματική Γνώση και Διδακτικές Πρακτικές. (σελ. 837-846). Αθήνα: ΕΝΕΔΙΜ

Χρήστου, Κ. Π. (2018). Η προκατάληψη του φυσικού αριθμού στις πράξεις – πέρα από το μέγεθος του αριθμού. Στο Θ. Ζαχαριάδης, Δ. Πόταρη, Γ. Ψυχάρης (επιμ.). Πρακτικά 7ου Πανελλήνιου Συνεδρίου της Ένωσης Ερευνητών της Διδακτικής των Μαθηματικών: Μαθηματική Γνώση και Διδακτικές Πρακτικές. (σελ. 931-941). Αθήνα: ΕΝΕΔΙΜ

Christou, K. P. (2018). The natural number bias in arithmetic operations: the case of the representational form of the number. In Bergqvist, E., Österholm, M., Granberg, C., & Sumpter, L. (Eds.). (2018). Proceedings of the 42nd Conference of the International Group for the Psychology of Mathematics Education (Vol. 2, pp. 267-274). Umeå, Sweden: PME.

Lemoni, I., Lemonides, C., & Christou, K. P. (2018). Mental calculation strategies for addition and subtraction with integers. In the 4rd International Conference Education Across Borders. (accepted, in press). Florina, Greece.

Karagiorgou, M. Α, & Christou, K. P. (2018). The Spontaneous Focusing οn Quantitative Relations (SFOR) in preschool students. In the 4rd International Conference Education Across Borders. (accepted, in press). Florina, Greece.

Κόρδα, Μ. Α., Μίχα, Ι., & Χρήστου, Κ. Π. (2017). Η προκατάληψη του φυσικού αριθμού σε πράξεις με φυσικούς αριθμούς και κλάσματα. Στο Φ. Γούσιας (Επιμ.), Τα Πρακτικά του 4ου Συνεδρίου Νέος Παιδαγωγός, (σελ. 824-832). Αθήνα, Ελλάδα: (ψηφιακή έκδοση, ISBN: 978-618-82301-2-5).

Christou, K. P. (2017). The Natural Number Bias in arithmetic operations – Beyond the size of the numbers. In the 3rd International Conference Education Across Borders. (p. 546-553), Bitola, FYROM.

Christou, K. P., Pollack, C., Vannuten, S., Van Hoof, J., Van Dooren, W. (2016) Testing the Number Navigation Game with Mathematics Educators. In The Book of Abstracts of the 10th International Conference on Conceptual Change - Conceptual Change Meets Other Disciplines (pp. 72), Florina, Greece.

Dimitriadis, T.E., Christou, K. P., (2016) The Natural Number Bias in Arithmetic Operations when Negative Numbers are Introduced. In The Book of Abstracts of the 10th International Conference on Conceptual Change - Conceptual Change Meets Other Disciplines (pp. 73), Florina, Greece.

Kemos, A., Christou, K. P., Vamvakoussi, X., (2016) Testing the Number Navigation Game with Mathematics Educators. In The Book of Abstracts of the 10th International Conference on Conceptual Change - Conceptual Change Meets Other Disciplines (pp. 46-47), Florina, Greece.

Christou, K. P. (2015) The Dual Aspect of Natural Number Bias in Arithmetic Operations. In The Book of Abstracts and Extended Summaries of the 16th Biennial Conference of the European Association for Research on Learning and Instruction (pp. 270-271), Limassol, Cyprus.

Christou, K. P., McMullen, J.,Van Dooren, W., Verschaffel, L., Lehtinen, E., (2015) The Rational Number Navigation Game - A Serious Game for Developing Rational Number Knowledge. In The Book of Abstracts and Extended Summaries of the 16th Biennial Conference of the European Association for Research on Learning and Instruction (pp. 655-656), Limassol, Cyprus.

Christou, K. P. (2015) The effect of Natural Number Bias in operations, size and the density of the rational numbers In Proceedings of the 6th National Conference of Greek Association of Researchers in Mathematics Education (ENEDIM) (pp. 688-697). Thessaloniki, Greece, EN.E.DI.M., (in Greek)

Dimitrakopoulou S. & Christou, K. P. (2015) Literal symbols as variables in Algebra - How students understand them and how they are presented n the mathematics schoolbook. Proceedings of the 32nd National Conference of Greek Mathematics Society (pp.273-284), E.M.E., Kastoria, Greece (in Greek)

Gatsioura, K., Zografou, K., Makarina, A., Michailidou M., Christou, K. P. (2015) An experiential activity of learning to construct frequency charts in the kindergarten, In the 2nd Educational Conference on Innovation, Creativity, Interdisciplinarity in the School (pp.50-51), Florina, Greece.

Dimitrakopoulou S. & Christou, K. P. (2014) How students interpret literal symbols and how they appear in the greek high school. In Mathematics in School and Everyday Life - Proceedings of the 5th National Conference of Greek Association of Researchers in Mathematics Education (ENEDIM) (pp. 1-10). Florina, Greece, EN.E.DI.M., ISSN: 1792-8494. (in Greek)

Christou, K. P. (2014) The Natural Number Bias in arithmetic operations. In Mathematics in School and Everyday Life - Proceedings of the 5th National Conference of Greek Association of Researchers in Mathematics Education (ENEDIM) (pp. 1-10). Florina, Greece, EN.E.DI.M., ISSN: 1792-8494. (in Greek)

Christou, K. P. (2013) Whole numbers bias in calculations with missing numbers – another chance for conceptual change. In The Book of Abstracts and Extended Summaries of the 15th Biennial Conference of the European Association for Research on Learning and Instruction (pp. 565-566), Munich, Germany.

Christou, K. P. (2012). Helping students remedy the phenomenal sign bias: The case of a refutational lecture. In C. Prachalias (Ed.) Proceedings of the 8^th International Conference on Education (pp. 643-648). Samos, Greece.

Christou, K. P., & Vosniadou, S. (2011) Changing the way students interpret the phenomenal sign of algebraic expressions: The effect of direct instruction. In The Book of Abstracts and Extended Summaries of the 14th Biennial Conference of the European Association for Research on Learning and Instruction (pp. 648-649). Exeter, UK.

Vamvakoussi, X., Mertens, L., Christou, K. P., & Van Dooren, W. (2011) Greek and Flemish students’ conceptual difficulties in the shift from (discrete) natural to (dense) rational numbers. In The Book of Abstracts and Extended Summaries of the 14th Biennial Conference of the European Association for Research on Learning and Instruction (pp. 1426-1427). Exeter, UK.

Arampatzis, K., & Christou, K. P. (2011). In M. Kaldrimidou & X. Vamvakoussi (Eds.), The transition from Arithmetic to Algebra, Solving and Categorizing Equations and Inequalities - Proccedings of the 4th National Conference of the Greek Association of Research in Mathematics Education (pp. 85-94). Ioannina, Greece. (in Greek)

Αραμπατζής, Κ., Χρήστου, Κ. Π., Βοσνιαδου, Σ (2011). Το Πέρασμα από την Αριθμητική στην Άλγεβρα, Λύση και Κατηγοριοποίηση Εξισώσεων και Ανισώσεων Στο Μ. Καλδρυμίδου & Ξ. Βαμβακούση (Επιμ.), Η τάξη ως πεδίο ανάπτυξης της μαθηματικής δραστηριότητας - Πρακτικά 4ου Πανελλήνιου Συνεδρίου Ένωσης Ερευνητών Διδακτικής των Μαθηματικών (σελ. 85-94). Ιωάννινα, Ελλάδα.

Christou, K. P., Vamvakoussi, X., & Van Dooren, W. (2011). Kinds of number values that variables can (not) represent - Greek and Flemish students responses. In M. Kaldrimidou & X. Vamvakoussi (Eds.), The transition from Arithmetic to Algebra, Solving and Categorizing Equations and Inequalities - Proccedings of the 4th National Conference of the Greek Association of Research in Mathematics Education (pp. 539-548). Ioannina, Greece. (in Greek)

Χρήστου, Κ. Π., Βαμβακούση, Ξ., & Van Dooren, W. (2011). Τι αριθμητικές τιμές (δεν) παίρνουν οι μεταβλητές – Απαντήσεις Ελλήνων και Βέλγων μαθητών. Στο Μ. Καλδρυμίδου & Ξ. Βαμβακούση (Εκδ.), 4o Πανελλήνιο Συνέδριο Ένωσης Ερευνητών Διδακτικής των Μαθηματικών (σελ. 539-548). Ιωάννινα, Ελλάδα.

Van Dooren, W., Christou, K.P., & Vamvakoussi, X. (2010). Greek and Flemish students’ interpretation of the literal symbols as variables. In M.M.F. Pinto & T.F. Kawasaki (Eds.), Mathematics in different settings – Proceedings of the 34th Conference of the International Group for the Psychology in Mathematics Education (Vol. 4, pp. 257-264). Belo Horizonte, Brazil: PME.

Vamvakoussi, X., Christou, K.P., & Van Dooren, W. (2010). Greek and Flemish students’ understanding of the density of rational numbers: More similar, than different. In M.M.F. Pinto & T.F. Kawasaki (Eds.), Mathematics in different settings – Proceedings of the 34th Conference of the International Group for the Psychology in Mathematics Education (Vol. 4, pp. 249-256). Belo Horizonte, Brazil: PME.

Christou, K.P. & Vosniadou, S. (2009). Misinterpreting the use of literal symbols in Algebra. In the Proceedings of the 33rd Conference of the International Group for the Psychology of Mathematics Education, (Vol 2, pp. 329-339), Thessaloniki, Greece: PME.

Christou, K. P. & Vosniadou, S. (2009). The misinterpretation of the phenomenal sign of algebraic expressions - A teaching intervention. In F. Kalavassis, S. Kafoussi, M. Chionidou-Moskofoglou, G. Fesakis, (Eds.), Proceedings of the 3rd National Conference of Greek Association of Researchers in Mathematics Education (pp. 229-308). Athens, Typothito. (in Greek)

Christou, K. P. & Vosniadou, S. (2007). How students understand the use of lietrals in mathematics. In C. Sakonides, D., Desli, (Eds.), Typical and non-Typical mathematics: Characteristics, relationships, characteristics, relationships and interactions within the mathematics education, Proceedings of the 2nd National Conference of Greek Association of Researchers in Mathematics Education (pp. 279-289). Athens, Typothito. (in Greek)

Χρήστου, Κ. Π., & Βοσνιάδου, Σ. (2007). Πως κατανοούν οι μαθητές τη χρήση των γραμμάτων στα μαθηματικά. Στο Χ. Σακονίδης & Δ. Δεσλή (Επιμ.), Τυπικά και άτυπα μαθηματικά: χαρακτηριστικά, σχέσεις και αλληλεπιδράσεις στο πλαίσιο της μαθηματικής εκπαίδευσης, Πρακτικά του 2ου Πανελλήνιου Συνεδρίου της Ένωσης Ερευνητών της Διδακτικής των Μαθηματικών (σελ. 279-289). Αθήνα: Τυπωθήτω. (in Greek)

Arampatzis, K., Skiadaressis, P., & Christou, K. P. (2007). Conceptual change from equations to inequalities with no solution or with real number solution. In C. Sakonides, D., Desli, (Eds.), Typical and non-Typical mathematics: Characteristics, relationships, characteristics, relationships and interactions within the mathematics education, Proceedings of the 2nd National Conference of Greek Association of Researchers in Mathematics Education (pp. 637-638). Athens, Typothito. (in Greek)

Christou, K. P., Vosniadou, S., & Vamvakoussi, X. (2007). Students’ interpretations of literal symbols in algebra. In S. Vosniadou, A. Baltas & X. Vamvakoussi (Eds.), Re-Framing the Conceptual Change Approach in Learning and Instruction (pp. 283-297): Elsevier Press.

Christou, K. P., Vosniadou, S., & Vamvakoussi, X. (2007). Interpreting the sign of algebraic expressions. In D. S. McNamara & J. G. Trafton (Eds.), Proceedings of the 29th Annual Cognitive Science Society (p.1723). Austin, TX: Cognitive Science Society.

Christou, K. P., & Vosniadou, S. (2006). Students’ Interpretation of the Use of Literal Symbols in Algebra – Α conceptual change approach. In J. Novotná, H. Moraová, M. Krátká, & N. Stehlíková (Eds.), Proceedings of the 30th Conference of the International Group for the Psychology of Mathematics Education (pp. 171-172). Prague:PME.

Christou, K. P. & Vosniadou, S. (2005). How Students Interpret Literal Symbols in Algebra: A Conceptual Change Approach. In B. G. Bara, L. Barsalou, & M. Bucciarelli (Eds.), Proceedings of the XXVII Annual Conference of the Cognitive Science Society, Italy. pp.453-458.

Vosniadou, S., Vamvakoussi, X., & Christou, K. P. (2005). What can we gain from a conceptual change approach to the learning and teaching of mathematics? In A. Gagatsis, F. Spagnolo, G. Makrides & V. Farmaki (Eds.), 4th Mediterranean Conference on Mathematics Education (Vol. 2, pp. 435-446). Palermo, Italy.

Christou, K. P., & Vosniadou, S. (2004). Conceptual change in the transition from arithmetic to algebra. In S. Vosniadou, C. Stathopoulou, X. Vamvakoussi, & N. Mamalougos (Eds.) Conceptual Change: Philosophical, Historical, Psychological and Educational Approaches - Proceedings of the 4th European Symposium on Conceptual Change (pp. 115-117). Athens: Gutenberg Press

Christou, K. P. & Vosniadou, S. (2004). Cognitive barriers in understanding the use of symbols of algebra. In N. Makris, & D. Desli (Eds.), Current trends in cognitive psychology: Bridges for the study of cognition - Proceedings in the National Conference of Cognitive Science, (pp. 303-306). Athens: Dardanos (In Greek)

Christou, K. P., Reid, N., & Vosniadou, S., (2003). Difficulties in solving algebra story problems. In Schmalhofer, F., Young, R.M., Katzz, G. (Eds.), Proceedings of the European Cognitive Science Conference 2003 (p.378). Osnavrück: University of Osnavrück.

Selective Conference Announcements

Christou, K. P., & Prokopou, A. (2019, August). Using refutational text to remedy the Multiplication Makes Bigger misconception. In The Book of Abstracts of the 18th Biennial Conference of the European Association for Research on Learning and Instruction, (p. 84), Aachen, Germany.

Van Dooren, W., Christou, K. P., Depaepe, F., Inglis, M., Määtä, S., McMullen, J., Obersteiner, A., Ribeiras, P.H., Van Hoof, J., Triantafyllou, M., Vamvakoussi, X., Verschaffel, L., Wittman, G., Wollacott, B (2019, August). Tackling the natural number bias – A comparative textbook analysis. In The Book of Abstracts of the 17th Biennial Conference of the European Association for Research on Learning and Instruction, (p. 84), Aachen, Germany.

Christou, K. P. & Kyrvei, D. (2021, August). NNB in understanding the concept of variable - the role of integrity and the phenomenal sign. In The Book of Abstracts of the 19th Biennial Conference of the European Association for Research on Learning and Instruction, (p. 190), Online Conference hosted by University of Gothenburg, Swede.

Dimitrakopoulou, S., & Christou, K. P. (2018, August). Natural Number Bias in understanding variables in algebra – the role of mathematics textbooks. In The Book of Abstracts of the 11th International Conference on Conceptual Change – Epistemic Cognition & Conceptual Change (p. 72), Klagenfurt, Austria.

Van Dooren, W., Pollack, C., Vannuten, S., Van Hoof, J., & Christou, K. P. (2018, August). Natural Number Bias when Reasoning about the Effect of Operations. In The Book of Abstracts of the 11th International Conference on Conceptual Change – Epistemic Cognition & Conceptual Change (p. 97), Klagenfurt, Austria.

Christou, K. P. (2017, August). The natural number bias also affects the representational form of arithmetic operation results. In the Book of Abstracts and Extended Summaries of the 17th Biennial Conference of the European Association for Research on Learning and Instruction (p. online edition), Tampere, Finland.

Pollack, C., Christou, K. P., Vannuten, S., Van Hoof, J., & Van Dooren, W. (2017, August). Natural Number Bias when reasoning with rational numbers and unknown operands. In the Book of Abstracts and Extended Summaries of the 17th Biennial Conference of the European Association for Research on Learning and Instruction (p. online edition), Tampere, Finland.

Christou, K. P., McMullen, J., Van Dooren, W., Verschaffel, L., & Lehtinen, E. (2015, August) The Rational Number Navigation Game - A Serious Game for Developing Rational Number Knowledge. In The Book of Abstracts and Extended Summaries of the 14th Biennial Conference of the European Association for Research on Learning and Instruction (pp. 655-656), Limassol, Cyprus.

Christou, K. P. (2015, August) The Dual Aspect of Natural Number Bias in Arithmetic Operations. In The Book of Abstracts and Extended Summaries of the 14th Biennial Conference of the European Association for Research on Learning and Instruction (pp. 270-271), Limassol, Cyprus.

Γκατζιούρα, Κ., Ζωγράφου, Κ., Μακαρίκα, Α., Μιχαϊλίδου, Μ., & Χρήστου, Κ. Π. (2015, Δεκέμβριος) Μία βιωματική δραστηριότητα κατασκευής διαγραμμάτων συχνοτήτων σε παιδιά του Νηπιαγωγείου. Εργασία που παρουσιάστηκε στη 2η Ημερίδα με τίτλο «Καινοτομία, Δημιουργικότητα, Διεπιστημονικότητα στο Σχολείο», Φλώρινα, Ελλάδα.

Christou, K. P., Pollack, C., Vannuten, S., Van Hoof, J., & Van Dooren, W. (2016, June). New Insights on Natural Number Bias in Arithmetic Operations. In K.P. Christou & H. Eshach (eds.) Conceptual Change Meets Other Disciplines - Abstracts of the 10th International Conference on Conceptual Change, (pp. 72), Florina: UOWM.

Dimitriadis, T. E., & Christou, K. P. (2016, June) The Natural Number Bias in Arithmetic Operations when Negative Numbers are Introduced. In K.P. Christou & H. Eshach (eds.) Conceptual Change Meets Other Disciplines - Abstracts of the 10th International Conference on Conceptual Change, (pp. 73), Florina: UOWM.

Kemos, A., Christou, K. P., & Vamvakoussi, X. (2016, June) Testing the Number Navigation Game with Mathematics Educators. In K.P. Christou & H. Eshach (eds.) Conceptual Change Meets Other Disciplines - Abstracts of the 10th International Conference on Conceptual Change, (pp. 46-47), Florina: UOWM.

Μπάμπη, Κ., & Χρήστου, Κ. Π. (2017). Η προκατάληψη του φυσικού αριθμού σε πράξεις με ακεραίους. Στο Θ. Ζαχαριάδης, Δ. Πόταρη, Γ. Ψυχάρης (επιμ.). Πρακτικά 7ου Πανελλήνιου Συνεδρίου της Ένωσης Ερευνητών της Διδακτικής των Μαθηματικών: Μαθηματική Γνώση και Διδακτικές Πρακτικές. (σελ. 950). Αθήνα: ΕΝΕΔΙΜ

Christou, K. P. (2017, August). The natural number bias also affects the representational form of arithmetic operation results. In the Book of Abstracts and Extended Summaries of the 17th Biennial Conference of the European Association for Research on Learning and Instruction (pp.), Tampere, Finland.

Pollack, C., Christou, K. P., Vannuten, S., Van Hoof, J., & Van Dooren, W. (2017, August). Natural Number Bias when reasoning with rational numbers and unknown operands. In the Book of Abstracts and Extended Summaries of the 17th Biennial Conference of the European Association for Research on Learning and Instruction (pp.), Tampere, Finland.

Dimitrakopoulou, S., & Christou, K. P. (2018, August) Natural Number Bias in understanding variables in algebra – the role of mathematics textbooks. In The Book of Abstracts of the 11th International Conference on Conceptual Change – Epistemic Cognition & Conceptual Change (pp. 72), Klagenfurt, Austria.

Van Dooren, W., Pollack, C., Vannuten, S., Van Hoof, J., & Christou, K. P. (2018, August) Natural Number Bias when Reasoning about the Effect of Operations. In The Book of Abstracts of the 11th International Conference on Conceptual Change – Epistemic Cognition & Conceptual Change (pp. 97), Klagenfurt, Austria.

Χρήστου, Κ. Π. (2019, Μάιος) Ο Πολλαπλασιασμός Πάντα Μεγαλώνει; Μια Περίπτωση Μάθησης με Εννοιολογική Αλλαγή Στα Μαθηματικά. Εργασία που παρουσιάστηκε στο 17ο Πανελλήνιο Συνέδριο Ψυχολογικής Έρευνας της Ελληνικής Ψυχολογικής Εταιρίας (ΕΛΨΕ), ως μέρος του προσκεκλημένου συμποσίου του Κλάδου Γνωστικής Ψυχολογίας, (σελ. 378-379), Αλεξανδρούπολη, Ελλάδα.

Van Dooren, W., Christou, K. P., Depaepe, F., Inglis, M., Määtä, S., McMullen, J., Obersteiner, A., Ribeiras, P.H., Van Hoof, J., Triantafyllou, M., Vamvakoussi, X., Verschaffel, L., Wittman, G., Wollacott, B (2019, August) Tackling the natural number bias – A comparative textbook analysis. In The Book of Abstracts of the 17th Biennial Conference of the European Association for Research on Learning and Instruction, (pp. 84), Aachen, Germany.

Prokopou, A, & Christou, K. P. (2019, August). Using refutational text to remedy the Multiplication Makes Bigger misconception. In The Book of Abstracts of the 17th Biennial Conference of the European Association for Research on Learning and Instruction, (pp. 84), Aachen, Germany.

Christou, K.P., McMullen, J. Van Dooren, W., Verschaffel, L. Lehtinen, E., (October, 2014) Mind the Gap! Considerations in the Development of a Rational Number Navigation Game, In the Proccedings of the Research on domain-specific serious games: state-of-the-art and prospects Workshop, Leuven, Belgium, 2014

Christou, K. P (2013, August). Whole numbers bias in calculations with missing numbers – another chance for conceptual change. Paper presented at the 15th Biennial Conference of the European Association for Research on Learning and Instruction, Munich, Germany.

Arambatzis, K., Christou, K. P., & Vosniadou, S (2010, May). The Transition from Arithmetic to Algebra: Categorization and Solving of Equations and Inequalities Paper presented at the 7th Biennial Meeting on Conceptual Change. Leuven, Belgium.

Christou, K. P., Vamvakoussi, X., VanDooren, W. (2010, May). Students’ Ways to Interpret Literal Symbols in Algebra – A Comparison Between Greek and Flemish Students. Paper presented at the 7th Biennial Meeting on Conceptual Change. Leuven, Belgium.

Vamvakoussi, X., Christou, K. P., VanDooren, W. (2010, May). How many numbers are there in an interval? Greek and Flemish 9th graders struggling with the density of numbers. Paper presented at the 7th Biennial Meeting on Conceptual Change. Leuven, Belgium.

Christou, K. P., & Vosniadou, S. (2009, August). Students’ Tendency to Think of Literal Symbols as Natural Numbers. Paper presented at the 13th European Conference on Research in Learning and Instruction. Amsterdam, Netherlands.

Christou, K. P., & Vosniadou, S. (2009, August). Transgressing the Barriers of Thinking with Natural Numbers in Understanding Variables in Algebra. Paper presented at the 13th European Conference on Research in Learning and Instruction. Amsterdam, Netherlands.

Christou, K. P., & Vosniadou, S. (2008, July). Natural numbers and their interference in students’ interpretations of literal symbols in algebra. Paper presented at the XXIX International Congress of Psychology. Berlin, Germany.

Christou, K. P., & Vosniadou, S. (2008, August). Understanding the concept of variable – a teaching intervention to foster conceptual change. Paper presented at the 6th International Conference on Conceptual Change. Turku, Finland.

VanDooren, W., Vamvakoussi, X., Christou, K. P. & Ellen Gillard (2008, August) Unravelling the cognitive obstacles in mathematical reasoning. Paper presented at the 6th International Conference on Conceptual Change. Turku, Finland.

Christou, K. P., & Vosniadou, S. (2007, August). Students’ interpretations of algebraic expressions in inequalities. Paper presented at the 11th European Conference on Research in Learning and Instruction. Budapest, Hungary.

Christou, K. P., & Vosniadou, S. (2006, July). Students’ Interpretation of the Use of Literal Symbols in Algebra – Α conceptual change approach. In J. Novotná, H. Moraová, M. Krátká, & N. Stehlíková (Eds.). Paper presented at the 30th Conference of the International Group for the Psychology of Mathematics Education. Prague, Czech Republic.