Number Conservation: Planting Monster Melons (Math Monsters)

While planting two gardens, the monsters learn that the number of monster melon seeds, and the length of two hoses, does not change when the objects are moved or rearranged.
ASIN: 0836838149
VSKU: RDV.0836838149.G
Condition: Good
Author/Artist:Burstein, John
Binding: Library