This is perfectly normal and happens because Happy Numbers adapts to each student's level,  scaffolding the instruction accordingly. While a student works within his ZPD (the zone of proximal development (Vygotsky, 1934), we individualize the scaffolding based on that student’s interaction with the system. Our technology allows us to do this in several ways:

• providing appropriate textual hints
• displaying visual feedback
• introducing interactive manipulatives
• adjusting numerical or graphical data in problem statements
• increasing or reducing the number of exercises

Thoughtfully weighed, the system response is just enough to support student mastery before moving ahead.

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