题目：
口算70×30，想：7×3=______，70×30=______．
答案：
口算70×30，可以先算7×3=21，所以70×30的结果是在21的末尾添2个0即2100．
故答案为：21，2100．
口算70×30，想：7×3=______，70×30=______．
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