This task is about finding and using rules for patterns.
a)  Use the addition rule given to fill in the boxes. 

The rule is


b)  Work out the addition rule, write it in the space given, and then use it to fill in the boxes. 
i) 
The rule is

ii) 
c)  Make up a rule which uses addition, write it in the space given, and then use it to fill in the boxes. 
My rule is
