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

2位数のひき算

タイルを「取り去る」イメージと、取り去った結果を求めるということを意識しましょう。

2-9分類法による指導順序

※水源地は3位数の減法にあるため、2位数同士の最も典型的な型は「小水源地」と名づけられました。

[小水源地]
\begin{array}{rr} & 99 \\ - & 22 \\ \hline \end{array}
\begin{array}{rr} & 99 \\ - & 20 \\ \hline \end{array}

\begin{array}{rr} & 99 \\ - & 29 \\ \hline \end{array}

\begin{array}{rr} & 90 \\ - & 20 \\ \hline \end{array}

\begin{array}{rr} & 99 \\ - & 92 \\ \hline \end{array}

\begin{array}{rr} & 99 \\ - & 90 \\ \hline \end{array}

\begin{array}{rr} & 99 \\ - & 99 \\ \hline \end{array}

\begin{array}{rr} & 90 \\ - & 20 \\ \hline \end{array}

\begin{array}{rr} & 99 \\ - & 2 \\ \hline \end{array}

\begin{array}{rr} & 99 \\ - & 9 \\ \hline \end{array}

\begin{array}{rr} & 99 \\ - & 0 \\ \hline \end{array}

\begin{array}{rr} & 90 \\ - & 0 \\ \hline \end{array}
[くり下がり1回]
\begin{array}{rr} & 92 \\ - & 29 \\ \hline \end{array}
\begin{array}{rr} & 90 \\ - & 29 \\ \hline \end{array}

\begin{array}{rr} & 92 \\ - & 89 \\ \hline \end{array}

\begin{array}{rr} & 90 \\ - & 89 \\ \hline \end{array}

\begin{array}{rr} & 92 \\ - & 9 \\ \hline \end{array}

\begin{array}{rr} & 90 \\ - & 9 \\ \hline \end{array}


92-29型のタイル操作

\begin{array}{rr} & 73 \\ - & 46 \\ \hline \end{array}の場合

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