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20以内的退位减法是一年级上册数学教学难点中的难点。在实际教学中,刚开始学生总会这样计算:先摆出相应数量的小棒,然后一根一根的减;或用双手先
Less than 20 abatement subtraction is difficult in the first grade mathematics teaching difficult. In the actual teaching, the beginning of the students always calculated this way: first put a corresponding number of small stick, and then subtract one by one; or with both hands first