Страница 31, ГДЗ по математике за 2 класс к проверочным работам Волковой. Серия "Школа России" к УМК Моро
Сложение и вычитание. Устные вычисления. Проверочная работа 2. Вариант 2
\[\begin{array}{|c|c|c|c|c|} \hline 59 & 30 & 87 & 98 & 70 \\ \hline \rule[-0.52em]{0pt}{1.66em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{5}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{2}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{2}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{3}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{8}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{0}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{9}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{1}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{6}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{3}}\kern0.035em} \\ \hline \end{array}\] Увеличь на 4: \[\begin{array}{|c|c|c|c|c|} \hline 25 & 64 & 90 & 72 & 83 \\ \hline \rule[-0.52em]{0pt}{1.66em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{2}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{9}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{6}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{8}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{9}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{4}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{7}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{6}}\kern0.035em} & \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{8}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{7}}\kern0.035em} \\ \hline \end{array}\]
\(1)\ 4 + 3 = \textcolor{#e03131}{\mathbf{7}}\text{ (р.)}\)
\(2)\ 4 + 7 = \textcolor{#e03131}{\mathbf{11}}\text{ (р.)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{11}}\) ракушек.
\(1)\ 18 - 8 = \textcolor{#e03131}{\mathbf{10}}\text{ (д.)}\)
\(2)\ 10 + 5 = \textcolor{#e03131}{\mathbf{15}}\text{ (д.)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{15}}\) детей.
\[\begin{aligned} 24 + \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{2}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{0}}\kern0.035em} &= 74 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 44}}}{-} 30 \\ 56 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 60}}}{+} 4 &= \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{7}}\kern0.035em}\hspace{-0.04em}\boxed{\kern0.035em\textcolor{#e03131}{\mathbf{7}}\kern0.035em} - 17 \end{aligned}\]