Решебник по математике 3 класс Моро Часть 2 | Страница 80

\[Страница\ 80.\ Верно?Неверно?\]

\[\boxed{\mathbf{1}\mathbf{.}\mathbf{\ }}\]

\[340 + 20 = 360 \neq 520\]

\[неверно.\]

\[\boxed{\mathbf{2}\mathbf{.}\mathbf{\ }}\]

\[860 - 400 = 460\]

\[верно.\]

\[\boxed{\mathbf{3}\mathbf{.}\mathbf{\ }}\]

\[700 - 600 = 100\]

\[верно.\]

\[\boxed{\mathbf{4}\mathbf{.}\mathbf{\ }}\]

\[980 - 30 = 950 \neq 650\]

\[неверно.\]

\[\boxed{\mathbf{5}\mathbf{.}\mathbf{\ }}\]

\[170 + 300 = 470\]

\[верно.\]

\[\boxed{\mathbf{6}\mathbf{.}\mathbf{\ }}\]

\[400 - 300 = 100 = 1\ сот.\]

\[верно.\]

\[\boxed{\mathbf{7}\mathbf{.}\mathbf{\ }}\]

\[9\ сот - 3\ сот = 6\ сот = 600\]

\[верно.\]

\[\boxed{\mathbf{8}\mathbf{.}\mathbf{\ }}\]

\[340 + 60 = 400 \neq 240 + 60\]

\[неверно.\]

\[\boxed{\mathbf{9}\mathbf{.}\mathbf{\ }}\]

\[8\ сот - 3\ дес = 800 - 30 = 770\]

\[верно.\]

\[\boxed{\mathbf{10}\mathbf{.}\mathbf{\ }}\]

\[970 - 500 = 470 > 370\]

\[верно.\]

\[\boxed{\mathbf{11}\mathbf{.}\mathbf{\ }}\]

\[840 - 700 = 140 < 150\]

\[270 + 700 = 970 > 960\]

\[700 + 300 = 1000\]

\[700 - 50 = 650\]

\[верно.\]