Patterns and rules

This task is about using different rules to continue number patterns.
 

a)

 

i)

 


Work out the rule and fill in the boxes to complete the number pattern below.


 4,

8,

 ,

 ,

 ...
  ii)

 

How did you complete the pattern?
 

 
 
b)

 

i)

 

Using a different rule to question a), fill in the boxes to complete another number pattern below.


 4,

8,

 ,

 ,

 ...
  ii)

 

How did you complete this pattern?