新课标提出:“口算既是笔算、估算和简便计算的基础,也是计算能力的重要组成部分。”良好的口算能力不仅是学习其他数学知识的基础,而且计算的合理、简捷、迅速、正确也反映了一个人的数学素养。因此,提高计算教学的有效性 The new curriculum proposed: “Mouth counting is not only the basis for calculating, estimating and calculating, but also an important part of computing power.” "Good numeracy skills are not only the basis for learning other maths, but also reasonable, simple, Correct also reflects a person’s mathematical qualities. Therefore, to improve the effectiveness of computational teaching