10 10 10 10 10
+ 5 + 6 + 7 + 8 + 9
--- --- --- --- ---
15 16 17 18 19
18 18 18 18 18
+ 5 + 6 + 7 + 8 + 9
--- --- --- --- ---
23 24 25 26 27
NOTE:
Note the relation between the second addend and the sum in each of the two
sets of examples on this page. Point this out to the student. Write out with
the student a couple more sets like the ones shown on this page (to a
maximum sum of 40).