More on skirting actual calculation (and higher-level problem solving) in Reform Math:
statistics in TERC/Investigations vs. Singapore Math
I. The closest the TERC/Investigations Math Student Activity Workbook gets to the topic of averages [click to enlarge]:
II. The third problem set involving averages in the Singapore Math Primary Mathematics 5B Workbook [click to enlarge]:
Comparing the relative difficulty of the two problem sets, speculate on why 5th grade Investigations avoids even simple problems involving averages.