100以内加减法笔算。
两位数加两位数加法的计算法则:
①相同数位对齐;
②从个位加起;
③个位满十向十位进1。
两位数减两位数的笔算法则:
①相同数位对齐;
②从个位减起;
③个位不够减,从十位退1,在个位上加10再减。
下面是相应的笔算练习:
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