Number: Factors and Primes

 

 


Factors are numbers we can multiply together to get a new number.

 

Example 1

4 and 2 are factors of 8, because of 4 × 2 = 8

Example 2

5 and 2 are factors of 10 because of 5 × 2 =10 

A point to remember is that a prime number has exactly two factors, 1 and the number itself.

A few prime numbers are 2,3,5,7,11,13 and the list continues.

 

A prime factor is a number that is a prime number but also a factor of another number,

therefore making it a prime factor.

Example 1

The prime factors of 15 are 5 and 3, as 5 × 3 = 15 (Remember, 5 and 3 are prime numbers)

Example 2

The prime factors of 10 are 2 and 5, as 2 × 5 = 10(Remember, 2 and 5 are prime numbers)