Ratnasari, G.I. , Widjajanti, D.B. and Andayani, S. 2023. Functional Thinking in Mathematics Learning: What and How to Measure it?. Indonesian Journal of Educational Research and Review. 6, 3 (Oct. 2023), 553–562. DOI:https://doi.org/10.23887/ijerr.v6i3.66682.