Balance pans

      
This task is about balancing the two sides of a set of scales and writing equations for some balanced scales.

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)