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学生学万以内不进位加法困难不大,但经常对错数位。因此,教师不仅应讲清算理算法,而且应严格要求学生养成正确的书写习惯。教学可分三步进行。第一步:由准备题过渡,引出计算法则。复习百以内的加法法则后出示过渡题42+34,要学生列竖式计算。算完后问:“写竖式时,你是怎样把相同的数位对齐的?”引导学生说出相同数位对齐就是把个位和个位对齐,十位和十位对齐。学生回答后,在横式两加数的百位上分别添上2
Difficulties for students not to learn additions are not large, but often the wrong number. Therefore, teachers should not only clarify arithmetic algorithms, but also require students to develop the correct writing habits. Teaching can be divided into three steps. The first step: the transition from the preparatory question leads to the law of calculation. After reviewing the law of addition within one hundred to produce the transitional question 42 + 34, students should calculate the vertical calculation. When finished, ask: “How do you align the same digits when you write the erection?” To guide students to align the same digits is to align the digits and digits, and the tenth and tenth digits are aligned. After the students answered, add 2 to each of the hundreds of horizontal plus two numbers