The number 3.142678 is
(a) an irrational number (b) a rational number
(c) a whole number (d) a natural number

The number 3.142678 is:

**(b) a rational number.**

A rational number is any number that can be expressed as a fraction of two integers. Since 3.142678 is a terminating decimal, it can be expressed as a fraction (e.g., 3142678/1000000), making it a rational number.

It is not:
- **(a) an irrational number**, because irrational numbers cannot be expressed as fractions and have non-terminating, non-repeating decimal expansions.
- **(c) a whole number**, because whole numbers are non-negative integers (0, 1, 2, 3...).
- **(d) a natural number**, because natural numbers are positive integers (1, 2, 3...), and 3.142678 is not an integer.

Would you like more details on rational and irrational numbers, or have any other questions?

Here are five related questions to deepen your understanding:
1. Can all terminating decimals be classified as rational numbers?
2. What is the difference between whole numbers and integers?
3. How can you express 3.142678 as a fraction?
4. What are some examples of irrational numbers?
5. How do natural numbers differ from real numbers?

**Tip:** Any decimal number that either terminates or repeats is always a rational number.

The number 3.142678 is (a) an irrational number (b) a rational number (c) a whole number (d) a natural number

Discover why the number 3.142678 is classified as a rational number and not an irrational, whole, or natural number. Understand the difference between rational and irrational numbers, and learn how decimals can be expressed as fractions. Suitable for students in Grades 6-8.

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