Условие:

Вычисли.
386 * 400

386 * 400 = 154400
$\begin{array}{r}\begin{array}{r}\times \end{array}\underline{\begin{array}{r}\mathrm{386 }\\ 400\end{array}}\\ \begin{array}{r}\mathrm{154400 }\end{array}\end{array}$