Types of Numbers (Junior Cert Mathematics): Flashcards

Positive whole numbers

$\mathbb{N}$

No, natural numbers start from 1

Whole numbers: positive, negative, or zero

$\mathbb{Z}$

Neither, but it is an integer

All numbers on the number line

$\mathbb{R}$

Numbers that can be written as a fraction

$\mathbb{Q}$

Numbers that cannot be written as a simple fraction

Numbers greater than 1 with only two factors: 1 and itself

Smallest and only even prime number

Natural numbers > 1 with more than two factors

Neither prime nor composite