Update. We've been discussing this chart:

http://www.eduplace.com/math/mw/background/2/01/te_2_01_overview.html

and filling out all the number bonds up to 20 on these blank sheets:

http://fivejs.com/wp-content/uploads/2011/12/number-bonds.pdf

And talking as we go about the relationship between the patterns on the chart and how many number bonds there are per number, it seems to be going exceptionally well.