4.5.1 Number Systems

What is a natural number?

Any positive whole number or zero

What is an application of natural numbers?

Counting items

What is the symbol for natural numbers?

N

What is an integer number?

Any whole number, positive or negative, including zero

What is the symbol for integer numbers?

Z

What is a rational number/quotient?

Numbers which can but do not necessarily have a fractional part

→ Can be positive or negative, including zero

→ A number is rational if it can be written exactly as a fraction

What is the symbol for rational numbers?

Q

What is an irrational number?

Any number which cannot be written exactly as a fraction

→ e.g. surds

What is the symbol of irrational numbers?

No symbol

What is a real number?

Any possible real world quantity

→ Includes all numbers of previous sets

What is an application of real numbers?

Measuring

What is the symbol for real numbers?

R

What is an ordinal number?

Integers to describe the numerical positions of objects