01 Data Rep Topic 1 Number Systems

Question 1

Natural numbers

Answer 1

Positive integers (whole numbers)
N = {0,1,2,3,…}

Question 2

Whole numbers

Answer 2

Any positive or negative whole numbers is called an integer
Z = {…-2,-1,0,1,…}

Question 3

Rational numbers

Answer 3

Include values that can be expressed as fractions or ratios
Q = {…}

Question 4

Irrational numbers

Answer 4

Numbers that cannot be expressed as a fraction

Question 5

real numbers

Answer 5

If a number is rational or irrational it is considered a real number (R)

Question 6

Hexadecimal base 16

Answer 6

0-15
0-9 A-F

Question 7

Advantages of HEX

Answer 7

Much easier to read and remember than a string of binary digits
Quicker to write or type, since a hex digit takes up only one character not four
There is less chance of making an error when typing hex characters than a string of 1s and 0s
Very easy to convert to and from binary