subtraction

Arithmetic Grade Two

Here we review how to regroup with two digit numbers:


     37
    -18 
   -----

To solve this problem, we regroup like this:


    tens   |   ones
   --------|---------
       2   |    17
    -  1   |     8
    -----------------
       1   |     9

Here's another easy example:


     44
    -17 
   -----

Here's the same problem after regrouping:


     3  |  14
   - 1  |   7 
   ------------
     2  |   7