Which product design principle has been proven most effective in mathematics education software according to recent cognitive science research?

In the world of educational mathematics products, design principles can make or break user engagement and learning outcomes. The best math learning tools incorporate specific design elements that enhance comprehension and retention. This question explores how product designers leverage mathematical principles to create more effective educational tools and software.

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Progressive difficulty algorithms that adapt to individual learning curves
Maximizing the number of problems presented per session to build endurance
Gamification elements that reward speed over conceptual understanding
Consistent visual interfaces that maintain identical layouts for all mathematical concepts