While helping a six-year-old with a math problem, it dawned on me that a review was in order. He appeared to be having trouble with the concept of zero. So I said, “Let’s say that I gave you 9 pencils. Courtney didn’t give you any. So, how many pencils do you have?”
“Ten? Let’s try that again.” I repeated the scenario.
Taku nodded. “Yep. Ten.”
“How did you get ten?”
“Easy. You gave me 9. I already had one at my table.”