learning the concept of one. your child will learn that the word "one" is talking about "how many" items there are (one!). math. level 2: 9 - 18 months. 15m. filtered (1) filters clear filters×. math×. science×. counting & cardinality×. data & measurement×. executive function×. logic and reasoning×. tools, tech, engineering×. 15m×. level 2: 9 - 18 months×. approaches to learning (1). math (1). life science (1). scientific concepts (1). physical science (2). geometry, spatial awareness & shapes (1). counting & cardinality (1). 10m (2). 15m (1). level 2: 9 - 18 months (1). level 3: 19 - 36 months (4). level 4: 3 - 4 years (9). level 5: 4 - 5 years (8). learning throughout the day (1). search show (1) cancel clear filters×. math×. science×. counting & cardinality×. data & measurement×. executive function×. logic and reasoning×. tools, tech, engineering×. 15m×. level 2: 9 - 18 months×. learning the concept of one. your child will learn that the word "one" is talking about "how many" items there are (one!). math. level 2: 9 - 18 months. 15m.