Страница 15, ГДЗ по математике за 2 класс к тренажёру Погореловой
Устные вычисления
\[\begin{aligned} 40 + 5 &= \textcolor{#e03131}{\mathbf{45}} & \qquad 64 - 4 &= \textcolor{#e03131}{\mathbf{60}} & \qquad 80 + 7 &= \textcolor{#e03131}{\mathbf{87}} \\ 67 - 7 &= \textcolor{#e03131}{\mathbf{60}} & \qquad 30 + 6 &= \textcolor{#e03131}{\mathbf{36}} & \qquad 33 - 3 &= \textcolor{#e03131}{\mathbf{30}} \\ 10 + 2 &= \textcolor{#e03131}{\mathbf{12}} & \qquad 91 - 1 &= \textcolor{#e03131}{\mathbf{90}} & \qquad 50 + 9 &= \textcolor{#e03131}{\mathbf{59}} \\ 38 - 8 &= \textcolor{#e03131}{\mathbf{30}} & \qquad 40 + 5 &= \textcolor{#e03131}{\mathbf{45}} & \qquad 74 - 4 &= \textcolor{#e03131}{\mathbf{70}} \\ 70 + 7 &= \textcolor{#e03131}{\mathbf{77}} & \qquad 28 - 8 &= \textcolor{#e03131}{\mathbf{20}} & \qquad 20 + 6 &= \textcolor{#e03131}{\mathbf{26}} \\ 24 - 4 &= \textcolor{#e03131}{\mathbf{20}} & \qquad 90 + 7 &= \textcolor{#e03131}{\mathbf{97}} & \qquad 68 - 8 &= \textcolor{#e03131}{\mathbf{60}} \\ 50 + 3 &= \textcolor{#e03131}{\mathbf{53}} & \qquad 42 - 2 &= \textcolor{#e03131}{\mathbf{40}} & \qquad 90 + 3 &= \textcolor{#e03131}{\mathbf{93}} \end{aligned}\]
\[\begin{aligned} 40 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{+}}}}\hspace{0.72em}} 7 &= 47 & \qquad 78 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{-}}}}\hspace{0.72em}} 8 &= 70 & \qquad 30 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{+}}}}\hspace{0.72em}} 4 &= 34 \\ 68 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{-}}}}\hspace{0.72em}} 8 &= 60 & \qquad 32 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{-}}}}\hspace{0.72em}} 2 &= 30 & \qquad 95 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{-}}}}\hspace{0.72em}} 5 &= 90 \\ 20 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{+}}}}\hspace{0.72em}} 4 &= 24 & \qquad 56 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{-}}}}\hspace{0.72em}} 6 &= 50 & \qquad 10 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{+}}}}\hspace{0.72em}} 9 &= 19 \\ 90 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{+}}}}\hspace{0.72em}} 5 &= 95 & \qquad 40 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{+}}}}\hspace{0.72em}} 3 &= 43 & \qquad 70 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{+}}}}\hspace{0.72em}} 3 &= 73 \\ 11 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{-}}}}\hspace{0.72em}} 1 &= 10 & \qquad 88 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{-}}}}\hspace{0.72em}} 8 &= 80 & \qquad 64 \mathbin{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{-}}}}\hspace{0.72em}} 4 &= 60 \end{aligned}\]
\[\begin{aligned} 24 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 20}}}{-} 4 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 10 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 19}}}{+} 9 & \qquad 64 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 60}}}{-} 4 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 50 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 56}}}{+} 6 \\ 40 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 49}}}{+} 9 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{<}}}}\hspace{0.72em}} 57 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 50}}}{-} 7 & \qquad 90 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 99}}}{+} 9 &\mathrel{\hspace{0.72em}\mathclap{\vcenter{\Large\bigcirc}}\mathclap{\textcolor{#e03131}{\pmb{\boldsymbol{>}}}}\hspace{0.72em}} 88 \overset{\mathclap{\textcolor{#808080}{\scriptstyle 80}}}{-} 8 \end{aligned}\]
