Classifying Real Numbers

Is 2 a natural number?

• True

• False

• Only if it is even

• Only if it is prime

What is a real number?

• Real numbers include all rational and irrational numbers.

• Real numbers are only whole numbers.

• Real numbers are numbers that can be expressed as a fraction.

• Real numbers are only positive numbers.

What are natural numbers?

• The set of positive integers starting from 1 (1, 2, 3, ...).

• The set of all integers including negative numbers.

• The set of all whole numbers including zero.

• The set of rational numbers that can be expressed as fractions.

What is the classification of the number 0?

• 0 is a whole number, an integer, and a rational number.

• 0 is a prime number.

• 0 is a natural number.

• 0 is an irrational number.

What is the definition of whole numbers?

• Whole numbers are negative integers (-1, -2, -3, ...).

• Whole numbers are non-negative integers (0, 1, 2, 3, ...).

• Whole numbers are all integers including negative numbers (0, 1, 2, 3, -1, -2, ...).

• Whole numbers are only the positive integers (1, 2, 3, ...).

Classify this number: -12

• real, rational, integer

• real, irrational, whole

• complex, rational, integer

• real, rational, natural

What is an integer?

• Whole numbers that can be positive, negative, or zero (-2, -1, 0, 1, 2, ...).

• Only positive whole numbers (1, 2, 3, ...).

• Any number that can be expressed as a fraction.

• Numbers that include decimals and fractions.

Give an example of an irrational number.

• √2

• 3/4

• 5

• π

A rational number:

• can be turned into a fraction.

• is always an integer.

• cannot be expressed as a decimal.

• is a type of irrational number.

What is the set of all natural numbers?

• {0, 1, 2, 3, ...}

• {1, 2, 3, ...}

• {1, 2, 3, 4, 5}

• {1, 2, 3, 4, 5, ...}