3.1 - Number Systems

Question 1

What are natural numbers?

Answer 1

Positive whole numbers used for counting, including zero
Set N

Question 2

What are integers?

Answer 2

Positive or negative whole numbers including 0
Set Z, includes set N

Question 3

What are rational numbers?

Answer 3

Any number expressed as a ratio or fraction
Set Q, includes set Z

Question 4

What are real numbers?

Answer 4

Any possible real world quantity expressed as a number
Set R, includes set Q
Excludes infinity

Question 5

What are ordinal numbers?

Answer 5

Numbers used to describe the numerical position of objects
4th, 2nd

Question 6

What does floor() and ceil() mean? Log10()

Answer 6

Floor = rounds the number down
Ceiling = rounds the number up
Log10() = shows how big the number is. How many times by 10 it is multiplied

Question 7

What are the pros of hexadecimal?

Answer 7

• easier to read and remember
• quicker to write or type
• less chance of making an error when typing
• easy to convert from and to binary