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不论是多位数的加、减、乘、除法,还是口算、笔算、简算,都离不开20以内加、减法这一基础。因此本册的教学重点是10以内的加、减法和20以内的进位加法。总复习应紧紧围绕这一重点进行。一、在复习10以内数的组成、分解,大小比较的基础上,再次通过实物演示或对图形的观察,引导学生深入理解10以内加、减法的含义及加、减法之间的内在联系与区别,能够根据一组实物或图形列出四个(两个加和两个减)算式,并根据算式间的内在联系,说出各算式的得数,同时把简单加减法应用题(求总数和剩余数)与之结合起来,既节省时间,又能使计算与应用密切联系起来,形成整体。应用题训
Whether it is multi-digit addition, subtraction, multiplication, division, or port count, pen calculation, simple calculations, are inseparable from the 20 plus, subtraction of this foundation. Therefore, the focus of this teaching is less than 10 plus, subtraction and carry within 20 addition. The general review should be closely focused on this focus. First, on the basis of reviewing the composition, decomposition and size comparison of numbers within 10, through the physical demonstration or the observation of the figure again, the students are guided to thoroughly understand the meaning of addition and subtraction within 10 and the internal relations and differences between addition and subtraction , According to a group of objects or graphics listed four (two plus and two subtraction) formula, and according to the interconnection between formulas, say the number of each formula, while the simple addition and subtraction algorithm (the total number And the remaining number) combined with it, save time, but also make the calculation and application of closely linked to form a whole. Application training