Prime factorisation
Prime factorisation
A prime number is a whole number which can only be divided evenly by one or itself. Composite numbers are whole numbers that is not prime or has more than 2 factors. Prime factorization is a process that looks for prime factors of a number.
Basic concepts:
 Determining Common Factors
 Using exponents to describe numbers
Lessons
Notes:
Factor : Numbers that can be multiplied together to give the original value
Ex: The factor of 15 is 5 & 3. Because $5 \times 3 = 15$
Prime numbers : A whole number that has only "two" factors: 1 & itself.
Ex: 2,3,5,7,11,13,17…
Composite numbers : A Whole number that is not prime or has more than 2 factors.
Ex: 4,6,8…
Zero & One : They are neither primer nor composite
Factor Tree : A method of finding prime factors by using a tree diagram.
Ex: Prime factors of 18 = $2 \times 3 \times 3$
Continuous Division : A method of finding prime factors by using a continuous division.
Ex: Prime factors of 72 = $2 \times 2 \times 2 \times 3 \times 3$

2.
Determine if the numbers are prime or composite.

3.
What are the prime factors of the following numbers?