Van Hiele's levels refers to stages in the development of

Options

A. fractions
B. number concept
C. place value
D. geometrical thinking

Explanation

**Step-by-Step Solution:**

1. **Understanding Van Hiele's Levels**: Van Hiele's levels are a framework that describes how students understand and develop their geometric thinking. There are five distinct levels, each representing a different stage in the development of geometric understanding.

2. **Identifying the Levels**:
- **Level 0 (Visualization)**: At this stage, students can recognize and name shapes based on their appearance. They can sort and arrange shapes but do not understand the properties that define them.
- **Level 1 (Analysis)**: Students begin to analyze shapes and understand their properties. They can identify relationships between shapes and start to classify them based on their characteristics.
- **Level 2 (Abstraction)**: At this level, students can abstract properties of shapes and create definitions. They can understand concepts like congruence and similarity and can define shapes based on their properties.
- **Level 3 (Deduction)**: Students can make formal deductions and understand the relationships between different geometric concepts. They can differentiate between necessary and sufficient conditions for properties of shapes.
- **Level 4 (Mathematical Rigor)**: This is the final level where students achieve a high level of understanding of geometric concepts. They can work with proofs and understand the rigorous mathematical definitions and theorems related to geometry.

3. **Conclusion**: The answer to the question is that Van Hiele's levels refer to stages in the development of **Geometrical Thinking**.

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