subtraction

Arithmetic Grade Two

Look at this subtraction problem:


     41
    - 8 
   -----

To solve this problem, we regroup like this:


    tens   |   ones
   --------|---------
       3   |    11
    -      |     8
    -----------------
       3   |     3

Here's another easy example:


     22
    - 7 
   -----

Here's the same problem after regrouping:


     1  |  12
   -    |   7 
   ------------
     1  |   5