Balance pans

This task is about writing balanced statements.
a)
In each diagram below, draw in blocks on the right-hand pan to make the scales balance. 
The blocks all weigh the same.
 
  i)
 
  ii)
 
  iii)
 
       
b)
For each balance pan diagram below, write an equation to show that the sides are equal. 
For example: 2 + 2 = 3 + 1.
 
  i)
 
  ii)
 
  iii)
 
  iv)