The question asks to identify the practice that is least beneficial for primary school mathematics learning.
Option B, Solving algorithm-based questions from workbooks, is considered the least desirable approach. Over-reliance on rote memorization and algorithmic procedures without understanding the underlying concepts can hinder deep mathematical comprehension in young learners.
The other options represent valuable pedagogical approaches:
Effective primary mathematics education emphasizes conceptual understanding, application, and reasoning over mere procedural execution.