Example Lessons

Pick a workbook to solve 12 preview exercises.

Base

Step 1 Play now Step 2 Play now Step 3 Play now Step 4 Play now Step 5 Play now Step 6 Play now

Plus

Step 1 plus Play now Step 2 plus Play now Step 3 plus Play now Step 4 plus Play now Step 5 plus Play now

Extra

Step 1 extra Play now Step 2 extra Play now Step 3 extra Play now Step 4 extra Play now Step 5 extra Play now Step 6 extra Play now