6h 28min, jun 23, 2008 y - When I was in 2nd grade I would use my fingers to add and subtract during a math problem.
Description:
This shows Concrete Operational Stage, because during this stage kids start to apply logic and they need to use their fingers as hand on examples.Added to timeline:
Date:
6h 28min, jun 23, 2008 y
Now
~ 17 years ago