The factors of  a number are all the numbers which divide into it exactly. .

 

 

 

                                              

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



Highest Common Factor (HCF)

The largest factor that two or more numbers have in common is called the HCF.

 

 


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



Prime Factors

 

 

Write 88 as a product of its prime factors

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 88 = 11 x 2 x 2 x 2

       = 23 x 11

 

 

 

 

 

 

 

A  multiple of a number can be exactly divided by that number.

 

Multiples of 5 are 5, 10, 15, 20…….

Multiples of 12 are 12, 24, 36, 48…….

Multiples of 3x2 are 3x2, 6x2, 9x2, 12x2…….

 

Lowest Common Multiple (LCM)

The LCM of two or more numbers is the lowest number which is a multiple of both numbers.

 

1.   Find the LCM of 6 and 8

Multiples of 6 are 6, 12, 18, 24, 30, 36,42, 48, 54, 60, 66,72 ..

Multiples of 8 are 8, 16, 24, 32, 40, 48, 56, 64, 72…

The LCM of 6 and 8 is 24    

 

2.  Place in order    smallest first.

 

Multiples of 5 are 5, 10, 15, 20, 25, 30, 35, 40, 45, 50…

Multiples of 8 are 8, 16, 24, 32, 40, 48, 56, 64, 72….

Multiples of 20 are 20, 40, 60, 80, 100…

 

The LCM of 5, 8 and 20 is 40

 

 

 

 


x8
 
Solution : In order