WHAT IS A PRIME NUMBER ?

PRIME NUMBER

A prime number has only two factors, 1 and the number itself.

2 is the only EVEN prime number.

15 is not a prime number even though15 is an odd number.

15 x 1=15

3 x 5 = 15

15 have four factors.

WATCH OUT!!

1 is NOT a prime number.

1 only has one factor.

The number 1 = (1 x 1 = 1 )

TOP TIP

of the day.

2 IS THE ONLY EVEN PRIME NUMBER.

MANY OF THE "WEIRD" ODD NUMBERS ARE PRIME NUMBERS.

First 30 Prime Numbers

2, 3 , 5, 7 , 9, 11, 13 , 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109

COMPOSITE NUMBERS

COMPOSITE NUMBERS

Composite numbers have more than 2 factors.

example: 4= (1, 2 & 4)

21= (1, 3, 7 & 21)

100 = ( 1, 2 , 4, 5 , 10, 20, 25 , 50 & 100)

COMPOSITE NUMBERS

4, 6 , 8, 10 , 12 , 14, 15, 16, 18 , 20, 21, 22, 24 , 25, 26, 27, 28, 30, 32, 33, 34 ,35, 36, 38, 39, 40, 42, 44, 45, & 46.

RATIONAL NUMBERS

A rational number is a number which can be written in a form as a fraction.

a/b where b can not be (0) zero.

INTEGER NUMBERS

Integer numbers are negative or positive whole numbers.

Integer numbers are any number that can be found on the number line.

THE SUM UP

• integer number

• rational number

• composition number

• prime number