Procedural fluency is the ability to apply procedures efficiently, flexibly, and accurately; to transfer procedures to different problems and contexts; to build or modify procedures from other procedures; and to recognize when one strategy or procedure is more appropriate to apply than another (NCTM 2014, 2020; National Research Council 2001, 2005, 2012; Star 2005).
"Fluency does involve being fast and accurate but the often missing part of fluency is flexibility. Flexibility is the most important aspect in developing true math fluency. " - Building Math Minds
Fluency: Simply Fast and Accurate? I Think Not! (NCTM) by Linda M. Gojak