Decomposing addition

I was playing an online game today with my son (who had just woken up) watching over my shoulder.

“What does ‘split 28’ mean, Daddy?” he asked me.

“Well, I just looted 28 coins and I’m sharing them with my friend,” I responded.

“Oh…hrmmm…….so you’ll get 18 each then!” he responded.

“How did you get that?” I asked back.*

“Well, I took 20 and split it into 10 and 10, and then I took the 8…oh…I forgot to split the 8 too. You and your friend will get 14 coins each.”

* I always ask that question, whether he is right or not.

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