determine whether each statement is true or false

2/3 is a rational number
-9 is a whole number
the square root of 64 is a rational number
pie is an irrational number
0 is a natural number

1 answer

Let's evaluate each statement:

  1. \( \frac{2}{3} \) is a rational number.

    • True. A rational number is any number that can be expressed as the quotient or fraction of two integers (where the denominator is not zero). \( \frac{2}{3} \) fits this definition.
  2. -9 is a whole number.

    • False. Whole numbers are non-negative integers (0, 1, 2, 3, ...), and -9 is negative.
  3. The square root of 64 is a rational number.

    • True. The square root of 64 is 8, which is a whole number and therefore a rational number.
  4. π (pi) is an irrational number.

    • True. π is well-known to be an irrational number, meaning it cannot be expressed as a fraction of two integers.
  5. 0 is a natural number.

    • False. Natural numbers are typically defined as positive integers (1, 2, 3, ...). Some definitions may include 0 as a natural number, but traditionally, it is not considered one.

In summary:

  1. True
  2. False
  3. True
  4. True
  5. False
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