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20以内的进位加法和退位减法是小学数学第一册的教学重点,也是小学数学中最基础的知识,通过这部分知识的教学,使学生能够熟练地进行口算,达到脱口而出,为以后学习多位数的加减法打好基础。要达到这一目的,在教学中必须采取多种多样的形式进行反复练习。下面介绍一种口算练习方法,供大家参考。具体做法如下:
The addition and subtraction within 20 is the primary focus of primary school mathematics teaching, but also the most basic knowledge of primary mathematics, through this part of the teaching of knowledge, so that students can proficient in oral arithmetic, to blurt out for the future to learn more Addition and subtraction of several lay a good foundation. To achieve this goal, you must take a variety of forms in teaching to practice repeatedly. Here's a port arithmetic exercise method for your reference. Specific practices are as follows: