３位数÷１位数［商２位数］（型分け）

次に商が２位数の問題に進みます。最初に立てる商が百位に立たず、十位に立つことに気づかせるよう指導します。
これは素過程　 $\setstretch{0.7} \begin{array}{rcc} \ &\ &\hspace{-0.2em}\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square \\ \end{array}$ 　の複合になるので、生徒が戸惑う場合は、素過程に分解して見せることで解決するでしょう。
商を立てる位置決めは、÷２位数のアルゴリズムに発展します。

３位数÷１位数［商２位数］の指導

［１］	問題
$\setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}$	$\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 137 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 258 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em6& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 345 \\ \end{array}$
［２］	問題
$\setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.8em}0 \\ \end{array}$	$\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 152 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 174 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 180 \\ \end{array}$
［３］	問題
$\setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}$	$\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 131 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 160 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em7& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 361 \\ \end{array}$
［４］［５］	問題
$\setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-0.9em}\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\boxtimes \\ \end{array}$	$\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 119 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 103 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em7& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 130 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 111 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em6& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 108 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 104 \\ \end{array}$
［６］	問題
$\setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{-0.2em}\square\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}$	$\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 100 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em9& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 104 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 101 \\ \end{array}$
［７］［８］	問題
$\setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-0.2em}\square\square \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \ &\ &\hspace{0.6em}\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\boxtimes \\ \end{array}$	$\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 147 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 278 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 289 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 216 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 248 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em6& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 546 \\ \end{array}$
［９］一次退化	問題
$\setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-0.2em}\square\hspace{0.2em}0 \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\square \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\square \\ \end{array}$	$\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em2& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 121 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 212 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 283 \\ \end{array}$
［１１］	問題
$\setstretch{0.8} \begin{array}{rcc} \ &\ &\hspace{-0.2em}\square\hspace{0.2em}0 \\ \cline{2-3} \kern1em\square& \kern-0.6em {\big)} \kern0.1em & \hspace{-1em}\square\square\hspace{0.2em}0 \\ \ &\ &\hspace{-1.75em}\square\square \\ \cline{2-3} \ &\ &\hspace{0.6em}\hspace{0.2em}0 \\ \end{array}$	$\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em3& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 150 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em4& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 360 \\ \end{array}$ $\setstretch{0.8} \begin{array}{rcc} \cline{2-3} \kern1em9& \kern-0.6em {\big)} \kern0.1em & \hspace{-0.8em} 810 \\ \end{array}$