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桌上有13個蛋糕,你吃掉了4個,我吃掉了2個,現在桌上剩下幾塊蛋糕?
13-4-2=7
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你本來有18元,媽媽再給你20元,請問你現在有多少錢?
18+20=38
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教室裡本來有23個小朋友,有9個出去跑出去上廁所,現在教室裡剩下幾個小朋友?
23-9=14
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把答案相同的算式連起來
Great job!!!
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