算数に強くなる!水道方式【水道方式とは何か】

算数を理解するための最善の方法

小数第2位を含むかけ算(型分け)

小数第2位を含むかけ算の分類方針

トル型 ツケ型 ツケ・トル型
 \setstretch{0.75} \begin{array}{rr} \color{white}9.9\color{black}3.2\textcolor{white}.5 \\ \times\color{white}9.9.\color{black}4.8 \\ \hline \color{white}9.\color{black}2\textcolor{white}.6\textcolor{white}.0\textcolor{white}.0 \\ 1\textcolor{white}.3\textcolor{white}.0\textcolor{white}.0\color{white}.0 \\ \hline 1\textcolor{white}.5.6\textcolor{white}.\cancel{0}\textcolor{white}.\cancel{0} \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}9.9\color{black}0.0\textcolor{white}.6 \\ \times\color{white}9.\color{black}0.3\textcolor{white}.2 \\ \hline \color{white}9.2.6.\color{black}1\textcolor{white}.2 \\ \color{white}1.3.\color{black}1\textcolor{white}.8\color{white}.0 \\ \hline 0.0\textcolor{white}.1\textcolor{white}.9\textcolor{white}.2 \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}9.9\color{black}0.0\textcolor{white}.5 \\ \times\color{white}9.\color{black}0.2\textcolor{white}.8 \\ \hline \color{white}9.2.6.\color{black}4\textcolor{white}.0 \\ \color{white}1.3.\color{black}1\textcolor{white}.0\color{white}.0 \\ \hline 0.0\textcolor{white}.1\textcolor{white}.4\textcolor{white}.\cancel{0} \\ \end{array}
  1. トル型:うしろの0をとる型
  2. ツケ型:積の小数点をうつとき、前の方に0をつける型
  3. ツケ・トル型:前者の2つを行う型
  4. ナイナイ型:0の処理の必要がない型


帯小数×帯小数 真小数×帯小数 帯小数×真小数 真小数×真小数
ナイナイ型  \setstretch{0.75} \begin{array}{rr} \color{white}9.\color{black}3.4\textcolor{white}.7 \\ \times\color{white}9.3.\color{black}2.8 \\ \hline \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}9.3.\color{black}0.8 \\ \times\color{white}9.\color{black}3.4\textcolor{white}.7 \\ \hline \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}9.\color{black}3.4\textcolor{white}.7 \\ \times\color{white}9.3.\color{black}0.8\\ \hline \end{array} 該当なし
トル型  \setstretch{0.75} \begin{array}{rr} \color{white}9.\color{black}3.4\textcolor{white}.5 \\ \times\color{white}9.3.\color{black}2.8 \\ \hline \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}9.3.\color{black}0.8 \\ \times\color{white}9.\color{black}3.4\textcolor{white}.5 \\ \hline \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}9.\color{black}3.4\textcolor{white}.5 \\ \times\color{white}9.3.\color{black}0.8\\ \hline \end{array} 該当なし
ツケ型 該当なし  \setstretch{0.75} \begin{array}{rr} \color{white}9.\color{black}0.0\textcolor{white}.2 \\ \times\color{white}9.\color{black}3.4\textcolor{white}.6 \\ \hline \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}9.\color{black}2.4\textcolor{white}.8 \\ \times\color{white}0.\color{black}0.0\textcolor{white}.2 \\ \hline \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}0.\color{black}0.0\textcolor{white}.2 \\ \times\color{white}0.\color{black}0.0\textcolor{white}.2 \\ \hline \end{array}
ツケ・トル型 該当なし  \setstretch{0.75} \begin{array}{rr} \color{white}9.\color{black}3.2\textcolor{white}.5 \\ \times\color{white}9.\color{black}0.0\textcolor{white}.2 \\ \hline \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}9.\color{black}0.0\textcolor{white}.2 \\ \times\color{white}0.\color{black}3.2\textcolor{white}.5 \\ \hline \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}0.\color{black}0.0\textcolor{white}.2 \\ \times\color{white}0.\color{black}0.0\textcolor{white}.5 \\ \hline \end{array}


小数第2位を含むかけ算の型分け

(1)小数2位×小数2位
 \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square\color{black}\square.\square\square \\ \times\color{white}\square.\square\color{black}\square.\square\square \\ \hline \color{white}\square.\square\color{black}\square\textcolor{white}.\square\square \\ \color{white}\square.\color{black}\square\square\textcolor{white}.\square\textcolor{white}\square \\ \square\textcolor{white}.\color{black}\square\square\color{white}.\square\square \\ \hline \square.\square\square\textcolor{white}.\square\square \\ \square.\square\square\textcolor{white}.\square\textcolor{white}\square \\ \square.\square\square\color{white}.\square\square \\ \square.\square\color{white}\square.\square\square \\ \square\color{white}.\square\square.\square\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square\color{black}\square.\square\square \\ \times\color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\square\square \\ \hline \color{white}\square.\square\color{black}\square\textcolor{white}.\square\square \\ \square\color{white}.\color{black}\square\square\textcolor{white}.\square\textcolor{white}\square \\ \hline \square.\square\square\textcolor{white}.\square\square \\ \square.\square\square\textcolor{white}.\square\textcolor{white}\square \\ \square.\square\square\color{white}.\square\square \\ \square.\square\color{white}\square.\square\square \\ \square\color{white}.\square\square.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\color{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}\square.\square\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square\color{black}\square.\square\square \\ \times\color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\color{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}\square.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\color{white}.\square\square \\ \end{array}
 \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\square\square \\ \times\color{white}\square.\square\color{black}\square.\square\square \\ \hline \color{white}\square.\square\square.\color{black}\square\square \\ \color{white}\square.\square\color{black}\square\textcolor{white}.\square\textcolor{white}\square \\ \square\textcolor{white}.\color{black}\square\square\color{white}.\square\square \\ \hline \square.\square\square\textcolor{white}.\square\square \\ \square.\square\square\textcolor{white}.\square\textcolor{white}\square \\ \square.\square\square\color{white}.\square\square \\ \square.\square\color{white}\square.\square\square \\ \square\color{white}.\square\square.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\color{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}\square.\square\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\square\square \\ \times\color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\square \square \\ \hline \color{white}\square.\square\square.\color{black}\square\square \\ \color{white}\square.\color{black}\square\square\textcolor{white}.\square\textcolor{white}\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\color{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}\square.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\color{white}.\square\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\square\square \\ \times\color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\color{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\textcolor{white}\square \\ \end{array}
 \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.2em}.\hspace{0.1em}0\hspace{0.2em}\square \\ \times\color{white}\square.\square\color{black}\square.\square\square \\ \hline \color{white}\square.\square\square.\square\color{black}\square \\ \color{white}\square.\square\square.\color{black}\square\textcolor{white}\square \\ \color{white}\square.\color{black}\square\square\color{white}.\square\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\square\color{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}\square.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\color{white}.\square\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square \\ \times\color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\square\square \\ \hline \color{white}\square.\square\square.\square\color{black}\square \\ \color{white}\square.\square\color{black}\square\textcolor{white}.\square\textcolor{white}\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square\color{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\textcolor{white}\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square \\ \times\color{white}\square.\square\color{black}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\textcolor{white}\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\hspace{0.1em}0\hspace{0.1em}\square \\ \end{array}
(2)小数2位×小数1位
 \setstretch{0.75} \begin{array}{rr} \color{white}\square.\color{black}\square.\square\textcolor{white}.\square \\ \times\color{white}\square.\square.\color{black}\square.\square \\ \hline \color{white}\square.\color{black}\square\textcolor{white}.\square\textcolor{white}.\square \\ \square\textcolor{white}.\square\textcolor{white}.\square\color{white}.\square \\ \hline \square.\square\textcolor{white}.\square\textcolor{white}.\square \\ \square.\square\textcolor{white}.\square\color{white}.\square \\ \square.\square\color{white}.\square.\square \\ \square\color{white}.\square.\square.\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\color{black}\square.\square\textcolor{white}.\square \\ \times\color{white}\square.\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square \\ \hline \square.\square\textcolor{white}.\square\textcolor{white}.\square \\ \square.\square\textcolor{white}.\square\color{white}.\square \\ \square.\square\color{white}.\square.\square \\ \square\color{white}.\square.\square.\square \\ \end{array}

 \setstretch{0.75} \begin{array}{rr} \color{white}\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square \\ \times\color{white}\square.\square.\color{black}\square.\square \\ \hline \color{white}\square.\square.\color{black}\square\textcolor{white}.\square \\ \square\textcolor{white}.\square\textcolor{white}.\square\color{white}.\square \\ \hline \square.\square\textcolor{white}.\square\textcolor{white}.\square \\ \square.\square\textcolor{white}.\square\color{white}.\square \\ \square.\square\color{white}.\square.\square \\ \square\color{white}.\square.\square.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\color{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}.\square.\square \\ \end{array}
 \setstretch{0.75} \begin{array}{rr} \color{white}\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square \\ \times\color{white}\square.\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\color{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}.\square.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\color{white}.\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square \\ \times\color{white}\square.\square.\color{black}\square .\square \\ \hline \color{white}\square.\square.\color{black}\square\textcolor{white}.\square \\ \color{white}\square.\textcolor{black}\square\textcolor{white}.\square\color{white}.\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\color{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}.\square.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\color{white}.\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square \\ \times\color{white}\square.\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\color{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square \\ \end{array}
(3)小数1位×小数2位
 \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square.\color{black}\square.\square \\ \times\color{white}\square.\color{black}\square.\square\textcolor{white}.\square \\ \hline \color{white}\square.\color{black}\square\textcolor{white}.\square\textcolor{white}.\square \\ \textcolor{white}\square\textcolor{white}.\square\textcolor{white}.\square\color{white}.\square \\ \square\textcolor{white}.\square\color{white}.\square.\square \\ \hline \square.\square\textcolor{white}.\square\textcolor{white}.\square \\ \square.\square\textcolor{white}.\square\color{white}.\square \\ \square.\square\color{white}.\square.\square \\ \square\color{white}.\square.\square.\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square.\color{black}\square.\square \\ \times\color{white}\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square \\ \hline \color{white}\square.\square.\color{black}\square\textcolor{white}.\square \\ \square\textcolor{white}.\square\textcolor{white}.\square\color{white}.\square \\ \hline \square.\square\textcolor{white}.\square\textcolor{white}.\square \\ \square.\square\textcolor{white}.\square\color{white}.\square \\ \square.\square\color{white}.\square.\square \\ \square\color{white}.\square.\square.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\color{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}.\square.\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}.\color{black}\square.\square \\ \times\color{white}\hspace{0.1em}0\hspace{0.1em}.\color{black}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\color{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}.\square.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\color{white}.\square \\ \end{array}
 \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square \\ \times\color{white}\square.\color{black}\square.\square\textcolor{white}.\square \\ \hline \color{white}\square.\square.\square.\color{black}\square \\ \color{white}\square.\square.\color{black}\square\color{white}.\square \\ \square\textcolor{white}.\square\color{white}.\square.\square \\ \hline \square.\square\textcolor{white}.\square\textcolor{white}.\square \\ \square.\square\textcolor{white}.\square\color{white}.\square \\ \square.\square\color{white}.\square.\square \\ \square\color{white}.\square.\square.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\color{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}.\square.\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square \\ \times\color{white}\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square \\ \hline \color{white}\square.\square.\square.\color{black}\square \\ \color{white}\square.\color{black}\square\textcolor{white}.\square\color{white}.\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\textcolor{white}.\square\color{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\square\color{white}.\square.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\color{white}.\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \color{white}\square.\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\square \\ \times\color{white}\square.\color{black}\hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\textcolor{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square\color{white}.\square \\ \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\hspace{0.1em}0\hspace{0.1em}\textcolor{white}.\square \\ \end{array}
(4)小数2位×整数
 \setstretch{0.75} \begin{array}{rr} \square.\square\square \\ \times\color{white}\square.\square\color{black}\square \\ \hline \square.\square\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \square.\square\square \\ \times\color{white}\square.\square\color{black}\square \\ \hline \square.\square\color{white}\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \square.\square\square \\ \times\color{white}\square.\square\color{black}\square \\ \hline \square\color{white}.\square\square \\ \end{array}
 \setstretch{0.75} \begin{array}{rr} \hspace{0.1em}0\hspace{0.1em}.\square\square \\ \times\color{white}\square.\square\color{black}\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \hspace{0.1em}0\hspace{0.1em}.\square\square \\ \times\color{white}\square.\square\color{black}\square \\ \hline \square.\square\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \hspace{0.1em}0\hspace{0.1em}.\square\square \\ \times\color{white}\square.\square\color{black}\square \\ \hline \square\color{white}.\square\square \\ \end{array}
 \setstretch{0.75} \begin{array}{rr} \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square \\ \times\color{white}\square.\square\color{black}\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square \\ \times\color{white}\square.\square\color{black}\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\square \\ \end{array}  \setstretch{0.75} \begin{array}{rr} \hspace{0.1em}0\hspace{0.1em}.\hspace{0.1em}0\hspace{0.1em}\square \\ \times\color{white}\square.\square\color{black}\square \\ \hline \hspace{0.1em}0\hspace{0.1em}.\square\color{white}\square \\ \end{array}
(5)整数×小数2位
(略)

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