29 degrees and 00 minutes minus 26 degrees and 50 minutes

29 degrees and 00 minutes minus 26 degrees and 50 minutes 

=3degrees - 50minutes

=2degrees + 60minutes - 50minutes

=2 degrees and 10 minutes

Also look here.

http://web2.0calc.com/questions/what-is-21hours-and-58-minutes-subtracted-by-4-36-p-m-equal

We can use the idea of "borrowing" here....just like we do when we subtract !!!!  Instead of "borrowing" 10s, we'll be "borrowing" minutes !!!!

Remembering that there are 60 minutes in each degree.....we can write 29 degrees as:

(28 degrees + 1 degree)   = (28 degrees 60 minutes)...therefore, we have:

    28 degrees 60 minutes

-  26 degrees  50 minutes

------------------------------

=   2 degrees  10 minutes

Just as Mekody has said........