When I grade 2 in Vietnam. In school math teacher taught us how to subtract. After the teaching is done, teachers ask questions: If add 1 to 5, would be how much? Both the class quiet.The teacher said:-For example, I'm giving them 5 pigeons, and then add one more. The children will have how many pigeons?I stood up to answer 7The teacher asked surprised: why seven? Why?-I explained:-Sir, at home I've got pigeons, Sir!
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