Страница 21, ГДЗ по математике за 1-4 класс к контрольным работам Волковой. Школа России
2 класс. Итоговая контрольная работа за I четверть. Вариант 4
\[\begin{aligned} &\begin{aligned} 1) & & 4 + 8 &= \textcolor{#e03131}{\mathbf{12}} & \qquad 7 + 9 &= \textcolor{#e03131}{\mathbf{16}} \\ & & 92 - 90 &= \textcolor{#e03131}{\mathbf{2}} & \qquad 59 + 1 &= \textcolor{#e03131}{\mathbf{60}} \\ & & 13 - 8 &= \textcolor{#e03131}{\mathbf{5}} & \qquad 16 - 7 &= \textcolor{#e03131}{\mathbf{9}} \\ & & 84 - 4 &= \textcolor{#e03131}{\mathbf{80}} & \qquad 60 - 1 &= \textcolor{#e03131}{\mathbf{59}} \end{aligned} \\[10pt] &\begin{aligned} 2) & & 9 + 5 - 7 &= \textcolor{#e03131}{\mathbf{7}} & \quad 17 - 9 + 6 &= \textcolor{#e03131}{\mathbf{14}} & \quad 15 - (13 - 5) &= \textcolor{#e03131}{\mathbf{7}} \end{aligned} \end{aligned}\]
\[\begin{aligned} 63\text{ дм} &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{<}}}}\hspace{0.72em}} \overset{\textcolor{#808080}{\scriptstyle 70\text{ дм}}}{7\text{ м}} & \qquad \overset{\textcolor{#808080}{\scriptstyle 80\text{ мм}}}{8\text{ см}} &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 28\text{ мм} \end{aligned}\]
\(1)\ 10 - 2 = \textcolor{#e03131}{\mathbf{8}}\text{ (п.)}\)
\(2)\ 8 - 5 = \textcolor{#e03131}{\mathbf{3}}\text{ (п.)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{3}}\) пирожка.
\(7 + 6 + 4 = \textcolor{#e03131}{\mathbf{17}}\text{ (дм)}\)
Ответ: \(\textcolor{#e03131}{\mathbf{17}}\) дм.
Ответ: \(\textcolor{#e03131}{\mathbf{2}}\) книги.
\(\textcolor{#808080}{{12 - 2 = 10},\ \ {8 + 2 = 10}}\)
2 класс. Итоговая контрольная работа за II четверть. Вариант 1
\[\begin{aligned} &\begin{aligned} 1) & & 27 + 70 &= \textcolor{#e03131}{\mathbf{97}} & \qquad 48 - 6 &= \textcolor{#e03131}{\mathbf{42}} \\ & & 32 + 8 &= \textcolor{#e03131}{\mathbf{40}} & \qquad 50 - 9 &= \textcolor{#e03131}{\mathbf{41}} \\ & & 64 - 30 &= \textcolor{#e03131}{\mathbf{34}} & \qquad 34 + 8 &= \textcolor{#e03131}{\mathbf{42}} \\ & & 73 + 4 &= \textcolor{#e03131}{\mathbf{77}} & \qquad 45 - 6 &= \textcolor{#e03131}{\mathbf{39}} \end{aligned} \\[10pt] &\begin{aligned} 2) & & 36 + (11 - 8) &= \textcolor{#e03131}{\mathbf{39}} \end{aligned} \end{aligned}\]
\[\begin{aligned} 74 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 80}}}{+} 6 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{=}}}}\hspace{0.72em}} 50 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 80}}}{+} 30 & \qquad 70 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 62}}}{-} 8 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{<}}}}\hspace{0.72em}} 69 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 63}}}{-} 6 \end{aligned}\]
\[\begin{aligned} 6 + \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{9}}\kern0.035em} &= 15 & \qquad 16 - \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{7}}\kern0.035em} &= 9 & \qquad \boxed{\kern0.035em\textcolor{#e03131}{\mathbf{8}}\kern0.035em} + 3 &= 11 \end{aligned}\]
Если \({a = 98}\), то \({a - 20 = 98 - 20 = \textcolor{#e03131}{\mathbf{78}}}\).


