Sari P, Hajizah MN, Purwanto S. The neutralization on an empty number line model for integer additions and subtractions: Is it helpful?. j. math. educ. [Internet]. 2020 Jan. 1 [cited 2025 May 9];11(1):1-16. Available from: http://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3677