Fig. 1
From: Exploring students’ procedural flexibility in three countries
Average frequency of student use of the standard algorithm (upper three figures) and situationally appropriate strategies (lower three figures) produced per task in percent per level. Note Levels are middle school (solid green), basic math track high school (dotted red circle) and advanced math track high school (dashed blue triangle). The first three tasks are presented in the order 1–3–2, so that each of the three first blocks is in integer–fraction–decimal coefficient order