Hướng dẫn giải

Đáp án đúng là: C

A. \[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,13}\\{\underline {\,\,27} }\end{array}\\\,\,\,\,\,\,91\\\,\,\,\underline {26\,\,\,} \\\,\,\,351\end{array}\]

B. \[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,\,38}\\{\underline {\,\,\,12} }\end{array}\\\,\,\,\,\,\,76\\\,\,\,\underline {38\,\,\,\,} \\\,\,\,456\end{array}\]

C. \[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,\,\,\,\,76}\\{\underline {\,\,\,\,\,\,\,19} }\end{array}\\\,\,\,\,\,\,\,684\\\,\,\,\underline {\,\,\,\,76\,\,\,\,} \\\,\,\,1\,\,444\end{array}\]

D. \[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,\,31}\\{\underline {\,\,\,12} }\end{array}\\\,\,\,\,\,\,62\\\,\,\,\underline {31\,\,\,\,} \\\,\,\,372\end{array}\]

So sánh: 351 < 372 < 456 < 1 444

Vậy phép tính có kết quả lớn nhất là: 76 × 19

Tính nhẩm. a) 15 × 100 = ..