🐸 Number Line Frog4–8 Hop up and down to add, subtract, and see number distances › 🧮 Abacus Stars5–10 Slide beads to add and take away, then do it in your head › ♞ Chess Steps6–10 Learn chess one rule at a time, from pawns to checkmate › 🏁 Spell Racer7–10 Race through 100 sentences and master their spellings ›