numberblocks adding and subtracting puzzle set

Explore the relationship between Numberblocks One through Ten by adding or subtracting One to find a new Numberblock friend. These 2-piece, self-correcting puzzles perfectly illustrate the power of Number Magic! Includes 20 colourful, 2-piece puzzles featuring Numberblocks One to Ten. Self-correcting puzzles are great for practicing early addition and subtraction from 1 to 10. Ages: 3+ CHOKING HAZARD! Small parts. Not for children under 3 yrs.