[請益] 小四數-逐次減項
一箱糖果有45顆 阿姨買了3箱 媽媽買了5箱
請問兩人共買了幾顆?
我是這麼教學生的
先算出媽媽跟阿姨共買了幾箱:3+5=8
再算出有幾顆:8*45 = 360
所以列一個式子:
(3+5)*45
= 8*45
= 360 A:360顆
然後隔天學生過來跟我說我教錯了
因為他們老師說正確算式是
45*(3+5)
=45*8
=360 A:360顆
因此作業這類型的題目全錯
想請問是我的方法真的錯了嗎?
因為解答是他們老師的寫法
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