Number line addition and subtraction III

This task is about showing how to solve addition & subtraction problems using a number line.
For the questions below show how to solve the equations on the number line. 
a) Use the number line below to show how to solve the equation: 78 +  = 123
 
 
 
 
 
b) Use the number line below to show how to solve the equation: 209 +  = 604
 
 
 
 
 
c) Use the number line below to show how to solve the equation: 230 -  = 125
 
 
 
 
 
d) Use the number line below to show how to solve the equation: 375 -  = 198