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The question asks: "What type of number is -1?" and provides the following answer choices:

- A) Whole number
- B) Integer
- C) Rational
- D) Irrational

Let's analyze which categories apply to \(-1\):

1. **Whole number**: Whole numbers are non-negative integers, starting from \(0, 1, 2, \dots\). Since \(-1\) is negative, it is **not** a whole number. So, option **A** is incorrect.

2. **Integer**: Integers include all whole numbers and their negatives. This means \(-1\) is an integer. So, option **B** is correct.

3. **Rational number**: A rational number is any number that can be expressed as the ratio of two integers, \(\frac{a}{b}\), where \(b \neq 0\). Since \(-1\) can be written as \(\frac{-1}{1}\), it is a rational number. So, option **C** is correct.

4. **Irrational number**: Irrational numbers cannot be written as a ratio of two integers (examples include \(\pi\), \(\sqrt{2}\), etc.). Since \(-1\) can be expressed as a ratio of two integers, it is **not** an irrational number. So, option **D** is incorrect.

### Correct answers:  
- **B) Integer**  
- **C) Rational**

Would you like more details or have any further questions?  

Here are some related questions for further exploration:
1. What is the difference between rational and irrational numbers?
2. Can all integers be considered rational numbers?
3. Why aren't negative numbers considered whole numbers?
4. What are examples of irrational numbers?
5. How would \(\frac{-1}{1}\) fit into the definition of rational numbers?

**Tip**: When classifying numbers, always consider the definitions carefully, especially for overlapping categories like integers and rational numbers!

Learn how to classify the number -1 by understanding number types. Discover why -1 is an integer and rational number, and explore the definitions behind whole numbers, integers, and rational numbers. Suitable for students in Grades 6-8.

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