Showing change

This task is about working out change with money.
a)
John had $2 to buy his lunch. He bought a pie for $1.50.
 
How much change was John given? __________
 
b)
Jenny had $5 and spent $3.80. Put a circle around the coins Jenny was given as change.
 
 
selection of NZ coins
 
  c)
  Rima had $10 and spent $6.70. Put a circle around the coins Rima was given as change.
 
  selection of NZ coins