2. Types of numbers
1. Counting numbers-These start with 1
and continue indefinitely (1,2,3,4……
2. Whole numbers-include all counting
numbers along with zero (0,1,2,3,4……
3. 3. Integers-Positive and negative whole
numbers, including zero (-3,-2,-
1,0,1,2,3,4……
5. Irrational numbers-Cannot
be expressed as fractions (ex. ,
4. Rational numbers-Expressible as
fractions ( ex. ¾,-2/5…
4. 6. Real numbers – Encompass to both
rational and irrational numbers.
8. Odd numbers-Not divisible by 2 (ex. 3,5,7….
7. Even Numbers- Divisible by 2( ex.
2,4,6,8,10 ……
9. Prime numbers-divisible only by 1 and themselves (ex. 5,7, 13….
10. Composite numbers-Have multiple factors (ex. 10,15, 28….
5. Computer Number system-
is a method of representing
numbers using specific rules.
It provides a consistent way
to express numerical values.
6. Decimal Number system (Base-10)
- the decimal system uses ten digits:
0,1,2,3,4,5,6,7,8 and 9.
-Each position to the left of the
decimal point represents powers of
10(units, tens, hundreds, thousands,
etc.).
7. Binary Number system (Base-2)
- the binary system uses only two
digits: 0 and 1.
-it is widely used in computer
science and digital electronics.
8. Octal Number system (Base-8)
- the Octal system uses eight
digits: 0,1,2,3,4,5,6 and 7.
-it is less common but still used in
some contexts.
9. - the hexadecimal system uses sixteen
digits: 0-9 and A-F.
1,2,3,4,5,6,7,8,and 9
A=10
B=11
C=12
D=13
E=14
F=15
-it is commonly used in computer
programming and memory
addressing.
