Number systems and bases

Question 1

what is a natural number

Answer 1

any positive whole number that is used for counting, 0,1,2,3
- includes 0

Question 2

what is an integer

Answer 2

any positive or negative whole number, including 0
represented by Z

Question 3

what is a rational number

Answer 3

any number that can be expressed as a ratio or a fraction - 1/2, where both the numerator and denominator are whole numbers
represented by “Q”

Question 4

what are real numbers

Answer 4

any possible real world quantity expressed as a number
- does not include imaginary numbers
- R

Question 5

what are ordinal numbers

Answer 5

a number used to describe the numerical position of objects

Question 6

What is a irrational number?

Answer 6

A number that can’t be expressed as a fraction like root 2 - expressed as P

Question 7

lowest and highest number that can be created with binary

Answer 7

0
2^n - 1

Question 8

Binary number to hexa decimal

Answer 8

• Put the binary number into groups of four binary digits

Question 9

Hexdecimal to binary

Answer 9

Group the numbers into four and translate each group to binary

Question 10

why is the hexadecimal number system used

Answer 10

• it’s simpler to represent a byte in just two digits
• fewer mistakes are likely to be made
• easier for technicians and computer users to write or remember hex values than a binary number

Question 11

when are hexadecimal values used

Answer 11

colour

Question 12

increasing size of bytes

Answer 12

kilo
kibi
mega
mebi
giga
gibi
tera
tebi

Question 13

why cant ascii be used for arithmetic

Answer 13

because the number character is not the same as the actual number value

Question 14

highest and lowest hex num

Answer 14

00
FF