WEBVTT

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下面來算46+43

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我再寫一遍

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豎著寫：46+43

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我們要怎麽處理呢？

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首先來看個位

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是6個1加3個1

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或者說是6和3 6+3=9

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6+3=9 個位是9

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然後看十位

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有兩種思考方法供大家參考

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可以看成是4+4=8

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但實際上

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因爲是在十位

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所以實際上是40+40=80

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或者把兩個數展開來看

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46=40+6

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之前也這麽處理過的

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這就是46

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而43=40+3

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我們之前也這麽處理過多位數

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那麽在相加的時候

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6+3=9

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40+40=80

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所以得到80+9 也就是89

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我之所以這麽寫

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是要告訴大家

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在把十位上的4相加時

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實際加的是40

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既然4在十位

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那麽也就意味著

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這個4其實是40

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8在十位上

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所以代表的是80