10 10 10 10 10
- 0 - 1 - 2 - 3 - 4
--- --- --- --- ---
10 9 8 7 6
18 18 18 18 18
- 0 - 1 - 2 - 3 - 4
--- --- --- --- ---
18 17 16 15 14
NOTE:
Note the relation between the bottom number and the difference 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.