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我在教学“异分母分数加减法”时,也出现过话题中的情形。教材情境图中的信息是:“空气质量等级为优的天数占全月天数的2/5,等级为良的天数占全月天数的1/2。”问题是:“空气质量等级为优和良的天数一共占全
When I was teaching ”different denominator fraction addition and subtraction “, also appeared in the topic of the situation. The information in the textbook is as follows: ”The days with good air quality grade account for 2/5 of the total number of days in the whole month, and the days with good grades account for 1/2 of the days in the whole month.“ The question is: ”The air quality level For the excellent and good days total accounted for