Math With One Child?

How do you do the beginning collective exercises with one child?  I feel like we're pushing it just doing it one time!  We made three people with me, Link and Bumblebee.  When we did static addition, Link was like "Yeah yeah, we added them up, is that it?"  So are there any variations I can do to encourage him practice this? Or should I just move on? 

I also felt like it was rather cumbersome to have all those number cards out!  We didn't do one large set and three small ones.  I just did one large and one small, and chose the numbers carefully.