小明做得对吗？小明是个聪明勤奋的好孩子。

这段时间，他学习了“商不变的性质”，感到很高兴，因为有些题如果应用这种规律来做，会非常简便和轻松！这天，小明在计算900÷40时想，因为900÷40＝90÷4，而90÷4＝22……2，所以900÷40＝22……2。

“这样做，真是太快了！”小明兴奋地想。

同学们，你认为他做得 对吗？

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