Mariana N, Sasmita FE. Designed activities on developing mental strategies using alms value-based learning trajectory in elementary school. j. math. educ. [Internet]. 2024 Aug. 11 [cited 2024 Sep. 19];15(3):859-82. Available from: http://jme.ejournal.unsri.ac.id/index.php/jme/article/view/662