20 30 40 60 20
+ 1 + 2 + 3 + 4 + 5
--- --- --- --- ---
21 32 43 64 25
20 30 50 10 60
+ 9 + 3 + 3 + 4 + 5
--- --- --- --- ---
29 33 53 14 65
NOTE:
Point out to the student that the digits in the one's column are added
together and that the digit in the ten's column just drops down to the
answer row. Make a few more problems
like these and solve them with the student.