phép nhân phân số: 1/2 x 2/3 =

\(\begin{array}{*{20}{c}}1\\\hline2\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline3\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline3\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline4\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}3\\\hline{20}\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline3\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}2\\\hline5\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}5\\\hline7\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{42}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline8\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline7\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}3\\\hline{28}\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline9\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline4\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline6\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}4\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}4\\\hline{15}\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline7\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}5\\\hline6\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{21}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline4\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline8\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}3\\\hline{32}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline6\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline9\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{27}\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline7\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}2\\\hline{35}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline{10}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}4\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}6\\\hline{25}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline8\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline3\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline{12}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline7\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}5\\\hline6\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{14}\end{array}\)

\(\begin{array}{*{20}{c}}4\\\hline9\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}4\\\hline{45}\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline{11}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline4\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}3\\\hline{22}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline8\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline7\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{28}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline4\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline4\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline5\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}5\\\hline6\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline6\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline7\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}4\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}8\\\hline{35}\end{array}\)

\[\begin{array}{*{20}{c}}5\\\hline9\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline8\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{24}\end{array}\]

\(\begin{array}{*{20}{c}}1\\\hline{10}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}7\\\hline8\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}7\\\hline{80}\end{array}\)

\(\begin{array}{*{20}{c}}4\\\hline5\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline9\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}8\\\hline{45}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline7\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline4\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}{15}\\\hline{28}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline{11}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}6\\\hline{55}\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline3\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}4\\\hline{15}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline{10}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}5\\\hline9\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline6\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline7\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline{14}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline5\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline6\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline{10}\end{array}\)

\(\begin{array}{*{20}{c}}4\\\hline7\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}{12}\\\hline{35}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline{12}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline3\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{16}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline4\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}5\\\hline6\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{24}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline5\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline9\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}2\\\hline{15}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline4\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}4\\\hline7\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline7\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline9\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{27}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline{11}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline7\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}6\\\hline{77}\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline9\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}2\\\hline{45}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline7\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}5\\\hline8\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{56}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline4\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}3\\\hline{10}\end{array}\)

\(\begin{array}{*{20}{c}}4\\\hline9\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}4\\\hline{27}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline{11}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline7\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}{10}\\\hline{77}\end{array}\)

\[\begin{array}{*{20}{c}}2\\\hline3\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}5\\\hline8\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{12}\end{array}\]

\(\begin{array}{*{20}{c}}1\\\hline8\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline9\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline{36}\end{array}\)

\(\begin{array}{*{20}{c}}4\\\hline7\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline{10}\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}6\\\hline{35}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline9\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}2\\\hline9\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline{11}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}4\\\hline9\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}8\\\hline{99}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline8\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}3\\\hline{40}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline3\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline7\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}2\\\hline{21}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline6\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline4\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline8\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline5\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline{10}\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}1\\\hline{25}\end{array}\)

\(\begin{array}{*{20}{c}}4\\\hline7\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}5\\\hline8\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{14}\end{array}\)

\(\begin{array}{*{20}{c}}1\\\hline4\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline{10}\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}3\\\hline{40}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline8\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline9\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}5\\\hline{36}\end{array}\)

\(\begin{array}{*{20}{c}}3\\\hline7\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}4\\\hline9\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}4\\\hline{21}\end{array}\)

\(\begin{array}{*{20}{c}}2\\\hline{11}\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}1\\\hline5\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}2\\\hline{55}\end{array}\)

\(\begin{array}{*{20}{c}}4\\\hline5\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}3\\\hline8\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}3\\\hline{20}\end{array}\)

\(\begin{array}{*{20}{c}}5\\\hline9\end{array}{\rm{ }} \times {\rm{ }}\begin{array}{*{20}{c}}2\\\hline{11}\end{array}{\rm{  =  }}\begin{array}{*{20}{c}}{10}\\\hline{99}\end{array}\)