- Skip-count by 2s, 5s and 10s
- Times 0 and times 1
- Doubles, half of ten, and tens
- Fours are double twos
- Threes and sixes: one more group
- Turn-arounds and mixed facts
- Split an array in two
- Add the two parts
- Splits in other places
- Sevens and eights by splitting
- Eights are double fours
- Nines: ten groups, take one away
- Unlocks after
- Opens up