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分数是小学数学重点之一。为了让学生掌握分数加减法的运算规律和性质,我在教学时是这样做的: 讲分数加、减法的意义时,从整数加、减法入手,引出分数加减法,让学生认识分数加减法和整数加减法的意义相同。如例1,把1/7改作20亩,2/7改作40亩,问题改作“雨天完成多少亩”求已知两数的和得:20+40=60(亩)。以此说明题中所列数字由整数变为分数,意义仍然相同。讲解运算方法时,可以引导学生观察题
Scores are one of the primary focuses of mathematics. In order to let the students master the law and nature of the addition and subtraction of the scores, I do the following in teaching: Speaking of the meanings of additions and subtractions, we start with the addition and subtraction of integers and introduce the addition and subtraction of scores to let the students know the scores plus Subtraction and integer addition and subtraction the same meaning. As in Example 1, change 1/7 to 20 mu and 2/7 to 40 mu. The question is changed to “How Much Does Rainy Finish?” Find the sum of two known numbers: 20 + 40 = 60 (mu). This shows that the numbers listed in the title from an integer into a score, the meaning remains the same. Explain the method of operation, you can guide students to observe the problem