To answer the question "At primary level, use of tangrams, dot games, patterns etc. helps the students to," we need to evaluate the options provided and determine which one aligns with the benefits of these activities.
### Step-by-Step Solution:
1. **Understanding the Activities**:
- Tangrams, dot games, and patterns are primarily visual and spatial activities. They involve manipulating shapes, recognizing patterns, and engaging in hands-on learning.
**Hint**: Consider what skills are developed through visual and spatial activities.
2. **Evaluating the Options**:
- **Option 1: Understand basic operations**:
- Basic operations include addition, subtraction, multiplication, and division. These operations are numerical and do not directly relate to the activities mentioned. Tangrams and dot games do not focus on numerical calculations.
**Hint**: Think about whether the activities involve numbers or calculations.
3. **Option 2: Develop spatial understanding**:
- This option suggests that these activities help students develop an understanding of shapes and spatial relationships. Tangrams, for instance, require students to fit shapes together, which enhances their spatial reasoning.
**Hint**: Reflect on how manipulating shapes can improve understanding of space and form.
4. **Option 3: Develop sense of comparing numbers**:
- Comparing numbers involves numerical values, which are not a focus of tangrams or dot games. These activities do not provide a context for comparing quantities.
**Hint**: Consider if the activities involve numerical comparisons.
5. **Option 4: Strengthen calculation skills**:
- Calculation skills involve performing arithmetic operations. Since tangrams and dot games do not require calculations, this option is also not applicable.
**Hint**: Assess whether the activities require arithmetic operations.
6. **Conclusion**:
- After evaluating all options, the most appropriate answer is that tangrams, dot games, and patterns help students to **develop spatial understanding**. This aligns with the hands-on and visual nature of these activities.
### Final Answer:
At the primary level, the use of tangrams, dot games, and patterns helps students to **develop spatial understanding**.
