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新课程标准提出:“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.”口算能力的提高与否,直接关系着学生计算能力和基本技能,而计算又是数学学科的基础.俗话说:“千里之行,始于足下.”的确,基础打不好,怎么进行高楼大厦的建造呢?没有20以内的加减法及表内乘除法,就谈不上百以内、万以内、多位数以及小数、分数等的计算.再大的数或再复杂的计算的每一个起点,都是以20以内的简单加
The new curriculum standard states: “Mouth counting is not only the basis of calculation, estimation and calculation but also an important part of calculation ability.” The improvement of the ability of calculation of a word is directly related to the calculation ability and basic skills of a student, As the saying goes: “The journey of a thousand miles begins with a single step.” Indeed, the foundation is not good, how to build high-rise buildings? There is no less than 20 additions and subtractions and table multipliers, Hundreds, less than ten thousand, multi-digit and fractional, fractional calculation, etc. The larger number or complex calculation of each starting point, are less than 20 simple plus