Master all the skills needed to be successful at 1st grade math! Set includes two 50-page books with 85 grade-level lessons and 15 advanced lessons. Included Hot Dots Pen brings lessons to life with immediate audio and visual feedback. Pen requires 2 AAA batteries (not included). # Pieces In Set: 5 Learning Skill: Math Power Source: Battery (not Included) Measurements: 8.2 Depth/Inches, 2 Height/Inches, 9.2 Length/Inches Base Material: 100% Paper Battery Size: Aaa Country of Origin: Imported