From the child's mouth part 2

I went shopping this evening. In front of me at the checkstand was a young woman with her little boy. She gave him two banknotes for him to pay with them. He looked at the banknotes and named the value correctly: 10 and 5. The mother praised him and asked how much 10 + 5 is. "Two", he said. I smiled an internal smile. Two banknotes. That's right. "Something like that", the mother said. The checker called out the total price and the mother told the boy to hand her the banknotes, which he did.