Страница 50, ГДЗ по математике за 4 класс к самостоятельным и контрольным работам Лопатковой
Умножение и деление на числа, оканчивающиеся нулями. Самостоятельная работа № 18. Вариант 1
\[\begin{aligned} 234 \cdot 7\,000 &= \boxed{\smash[b]{\underset{\hspace{6em}}{\textcolor{#e03131}{\mathbf{1\,638\,000}}}}} \\ 29\,740 \cdot 200 &= \boxed{\smash[b]{\underset{\hspace{6em}}{\textcolor{#e03131}{\mathbf{5\,948\,000}}}}} \end{aligned}\] \[\begin{array}{cr} & \vphantom{\overset{\bullet}{0}}234\phantom{000} \\ \smash{\raisebox{0.62em}{$\times$}} & 7000 \\ \hline & \textcolor{#e03131}{\mathbf{1}\kern-0.075em\mathbf{6}\kern-0.075em\mathbf{3}\kern-0.075em\mathbf{8}\kern-0.075em\mathbf{0}\kern-0.075em\mathbf{0}\kern-0.075em\mathbf{0}\kern-0.075em} \end{array} \qquad \begin{array}{cr} & \vphantom{\overset{\bullet}{0}}29740\phantom{00} \\ \smash{\raisebox{0.62em}{$\times$}} & 200\phantom{0} \\ \hline & \textcolor{#e03131}{\mathbf{5}\kern-0.075em\mathbf{9}\kern-0.075em\mathbf{4}\kern-0.075em\mathbf{8}\kern-0.075em\mathbf{0}\kern-0.075em\mathbf{0}\kern-0.075em\mathbf{0}\kern-0.075em} \end{array}\]
\(1)\ 490 - 140 = \textcolor{#e03131}{\mathbf{350}}\text{ (км)}\)
\(2)\ 350 : 5 = \textcolor{#e03131}{\mathbf{70}}\text{ (км/ч)}\)
\(3)\ 140 : 70 = \textcolor{#e03131}{\mathbf{2}}\text{ (ч)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{2}}\) ч.

\[\begin{array}{r} \vphantom{\boxed{\mathbf{0}}}\hspace{1.45em}\hspace{0.725em}\mathclap{6}\hspace{0.725em}\hspace{0.725em}\mathclap{3}\hspace{0.725em}\hspace{0.725em}\mathclap{\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{2}}\kern0.035em}}\hspace{0.725em}\hspace{0.725em}\mathclap{\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{0}}\kern0.035em}}\hspace{0.725em}\hspace{0.725em}\mathclap{\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{0}}\kern0.035em}}\hspace{0.725em}\hspace{1.45em} \\ \vphantom{\boxed{\mathbf{0}}}\rule[-0.55em]{0pt}{0.55em}\hspace{0.725em}\mathclap{\smash{\raisebox{0.72em}{$\times$}}}\hspace{0.725em}\hspace{1.45em}\hspace{1.45em}\hspace{0.725em}\mathclap{\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{4}}\kern0.035em}}\hspace{0.725em}\hspace{0.725em}\mathclap{0}\hspace{0.725em}\hspace{1.45em}\hspace{1.45em} \\ \hline \vphantom{\boxed{\mathbf{0}}}\rule{0pt}{1.2em}\hspace{0.725em}\mathclap{\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{2}}\kern0.035em}}\hspace{0.725em}\hspace{0.725em}\mathclap{\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{5}}\kern0.035em}}\hspace{0.725em}\hspace{0.725em}\mathclap{2}\hspace{0.725em}\hspace{0.725em}\mathclap{8}\hspace{0.725em}\hspace{0.725em}\mathclap{\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{0}}\kern0.035em}}\hspace{0.725em}\hspace{0.725em}\mathclap{\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{0}}\kern0.035em}}\hspace{0.725em}\hspace{0.725em}\mathclap{\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{0}}\kern0.035em}}\hspace{0.725em} \end{array}\] \(\textcolor{#808080}{\text{Подходит и }{63\,800 \cdot 60 = 3\,828\,000}\text{.}}\)