# Chapter 1: Types of Numbers (Part 1)

Below, you can find links to selected SAGE Journal Articles to explore some of the chapter topics further.

Das, R., LeFevre, J.-A. and Penner-Wilger, M. (2010) ‘Negative Numbers in Simple Arithmetic’, *Quarterly Journal of Experimental Psychology*, 63(10), pp. 1943–1952.

Powell, S. R. (2015) ‘The Influence of Symbols and Equations on Understanding Mathematical Equivalence’, *Intervention in School and Clinic*, 50(5), pp. 266–272.

Ramirez, G. et al. (2018) ‘Teacher Math Anxiety Relates to Adolescent Students’ Math Achievement’, *AERA Open*.