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(一)教學目的因為§171是分數一章的最後一個小單元,而分數四則的運算理論及法則前面都已講过,此較简單的應用問题的解法,學生已具有相當的基礎,因此,§171的教學目的似應着重兩點:(1)把以前學過的分數四則,再加鞏固一下,即對於加減乘除的混合算式。要使學生演算得正確和熟練,特別是關於口算的地方,要使學生掌握一定程度的熟練技巧。(2)關於混合使用加減乘除的應用問題,要使學生理解並能熟練地作出解法。正如教學大綱(草案)算術部分說明中所謂:“算術教學的目的在於教會學生自觉地、
(I) Purpose of teaching Because § 171 is the last subunit of the chapter on scores, the arithmetic theory and the law of the four scores have already been mentioned. This simpler application of the solution to the problem has a considerable foundation for students. The teaching purpose of § 171 seems to focus on two points: (1) Four scores that have been learned in the past, plus a consolidation, that is, a mixed formula for addition, subtraction, multiplication and division. To enable students to perform correctly and skillfully, especially in the place of oral calculations, students should be taught a certain degree of proficiency. (2) Questions about the application of mixed use of addition, subtraction, multiplication, division, and division are to be understood and skillfully interpreted by students. As stated in the grammar section of the syllabus (draft), “The purpose of arithmetic teaching is to teach students to consciously