Patterns and rules II

This task is about completing and describing a rule for how some number patterns change.
a) i) Complete this number pattern by filling in the boxes.
 
    1, 3, 5, , , ,
    
ii)
  
How did you complete the pattern?
 
 
 

b)

i)

Complete this number pattern by filling in the boxes.
 

    1, 6, 11, , , ,
    
ii)
  
How did you complete the pattern?
 
 
 

c)

i)

Complete this number pattern by filling in the boxes.
 

    27, 24, , 18, , ,
   
ii)
 
How did you complete the pattern?
 
 
 

d)

i)

Complete this number pattern by filling in the boxes.
 

    2, 4, , 16, , , 128
   
ii)
 
How did you complete the pattern?