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1. 算一算。
$0\times7=$ $200\times4=$ $900\div3=$ $400\times5=$
$0\div6=$ $400\div8=$ $300\times6=$ $120\div4=$
$0\times7=$ $200\times4=$ $900\div3=$ $400\times5=$
$0\div6=$ $400\div8=$ $300\times6=$ $120\div4=$
答案
2. 用竖式计算。
$\begin{array}{r}4\enclose{longdiv}{408}\end{array}$ $\begin{array}{r}3\enclose{longdiv}{540}\end{array}$
$\begin{array}{r}2\enclose{longdiv}{506}\end{array}$ $\begin{array}{r}6\enclose{longdiv}{960}\end{array}$
$\begin{array}{r}4\enclose{longdiv}{408}\end{array}$ $\begin{array}{r}3\enclose{longdiv}{540}\end{array}$
$\begin{array}{r}2\enclose{longdiv}{506}\end{array}$ $\begin{array}{r}6\enclose{longdiv}{960}\end{array}$
答案
3. 判一判。对的打“√”，错的打“×”，并把错误的改正过来。
$\begin{array}{r}15\\3\enclose{longdiv}{450}\\3\\\hline150\\150\\\hline0\end{array}$ 改正：
$\begin{array}{r}201\\4\enclose{longdiv}{804}\\804\\\hline0\end{array}$ 改正：
$\begin{array}{r}15\\3\enclose{longdiv}{450}\\3\\\hline150\\150\\\hline0\end{array}$ 改正：
$\begin{array}{r}201\\4\enclose{longdiv}{804}\\804\\\hline0\end{array}$ 改正：
答案
