Section 3 Chapter 13 - Number Systems

Question 1

Natural number

Answer 1

A whole number used in counting

Question 2

Rational number

Answer 2

Any number that can be expressed as a ratio or fraction

Question 3

Integer

Answer 3

A whole number

Question 4

Irrational number

Answer 4

A number which cannot be expressed as a fraction such as pi or root(2)

Question 5

Ordinal number

Answer 5

A number used to describe the position of an object that is placed in order. e.g. first or seventh

Question 6

Why hexadecimal is used (2)

Answer 6

• It is easier to remember hex numbers

- Concise and can represent a byte in 2 digits

Question 7

Real Numbers

Answer 7

All rational + irrational numbers - the set of all possible real world quantities

Question 8

Main use of natural numbers

Answer 8

counting

Question 9

Main use of real numbers

Answer 9

measurement