Partial Sums- Another Addition Strategy

One of the major math concepts we are working on this week is known as "Partial Sums."  
It is another double-digit addition strategy.  We have worked a lot on this skill yesterday and today.  It will take lots of practice!  I will say that one of the main elements in solving this problem correctly is simply writing neatly and keeping the place values lined up with one another.


Example:
   45
+ 36
Add the tens 40 + 30 =70
Add the ones 5 + 6 = 11
So then add the tens and ones together
  70
+11
  81
****The problem should be written out like this....
  45
+36
  70
+11
  81