\[\boxed{\mathbf{Вариант\ 2.}}\]
\[\boxed{\mathbf{1.}}\]
\[513.\]
\[\boxed{\mathbf{2.}}\]
\[299 + 1 = 300\]
\[Ответ:300.\]
\[\boxed{\mathbf{3.}}\]
\[698 - 98 = 600\]
\[Ответ:600.\]
\[\boxed{\mathbf{4.}}\]
\[3\ сот.\ 6\ дес. = 360\]
\[900 - 640 = 260\]
\[720\ :6 = 120\]
\[40 \cdot 9 = 360\]
\[Ответ:40 \cdot 9 = 360.\]
\[\boxed{\mathbf{5.}}\]
\[\boxed{\mathbf{6.}}\]
\[\boxed{\mathbf{7.}}\]
\[\boxed{\mathbf{8.}}\]
\[Ответ:2.\]
\[\boxed{\mathbf{9.}}\]
\[30 \cdot 10 = 300\]
\[300 - 260 = 40\]
\[Ответ:на\ 40.\]