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The number provided, 0.5555, is a **rational number**. Here’s why:

A rational number is any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero. The number 0.5555 is a terminating decimal, which means it has a finite number of decimal places. Therefore, it can be written as a fraction, making it rational.

### Answer:
**A. Rational**

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Here are some related questions that could expand on this information:
1. How can we convert a terminating decimal to a fraction?
2. What is the difference between rational and irrational numbers?
3. Can all repeating decimals be considered rational?
4. How do we classify numbers like the square root of 2?
5. What are some examples of irrational numbers?

**Tip:** A number is rational if it either terminates or repeats in its decimal form.

Is the following number rational or irrational? 0.5555

Find out if the number 0.5555 is rational or irrational. This question covers the concept of rational and irrational numbers, with an explanation on how to identify a terminating decimal as rational. Ideal for middle school students learning about number classification.

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