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四则运算(一)

四则运算(一). 滑冰区有 72 人,滑雪区有 36 人, 冰雕区有 180 人。. 例 1. 滑冰场上午有 72 人,中午有 44 人离去,又有 85 人 到来。. 现在有多少人滑冰?. 例 2 “ 冰天雪地” 3 天接待 987 人。照这样计算, 6 天 预计接待多少人?. 3 天接待 987 人. 3 天接待 987 人. 6 天预计接待多少人?. 6 天预计接待多少人?. 6÷3. 987÷3. ×987. ×6. = 329×6 = 1974 (人). = 2×987 = 1974 (人). 答: 6 天预计接待 1974 人。.

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四则运算(一)

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  1. 四则运算(一)

  2. 滑冰区有72人,滑雪区有36人, 冰雕区有180人。

  3. 例1 滑冰场上午有72人,中午有44人离去,又有85人 到来。 现在有多少人滑冰?

  4. 例2 “冰天雪地”3天接待987人。照这样计算,6天 预计接待多少人? 3天接待987人 3天接待987人 6天预计接待多少人? 6天预计接待多少人? 6÷3 987÷3 ×987 ×6 =329×6 =1974(人) =2×987 =1974(人) 答:6天预计接待1974人。

  5. 在没有括号的算式里,如果只有加、减法 或者只有乘、除法,都要按从左往右的顺序 计算。

  6. 练习: 1、图书室有故事书98本,今天借出46本,还回25本。 现在图书室有故事书多少本? 2、一箱橙汁48元。芳芳 要买3瓶,需付多少钱? 12瓶

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