\[\boxed{\mathbf{Вариант\ 1.}}\]
\[\boxed{\mathbf{1.}}\]
\[Ответ:\ \ \ 917.\]
\[\boxed{\mathbf{2.}}\]
\[863 = 800 + 60 + 3.\]
\[\boxed{\mathbf{3.}}\]
\[1000 - 999 = 1\]
\[Ответ:\ \ \ на\ 1.\]
\[\boxed{\mathbf{4.}}\]
\[758 - 50 = 708\]
\[Ответ:\ \ \ 708.\]
\[\boxed{\mathbf{5.}}\]
\[290 - 90 = 200\]
\[Ответ:\ \ \ 200.\]
\[\boxed{\mathbf{6.}}\]
\[Ответ:\ \ \ 198,\ 199,\ 200,\ 201,\ 202.\]
\[\boxed{\mathbf{7.}}\]
\[408 < 418\]
\[Ответ:\ \ \ 0.\]
\[\boxed{\mathbf{8.}}\]
\[Ответ:\ \ \ 100.\]
\[\boxed{\mathbf{9.}}\]
\[4 + 9\ сот = 4 + 900 = 904\]
\[Ответ:\ \ \ 904.\]
\[\boxed{\mathbf{10.}}\]
\[Ответ:\ \ \ 682,\ 286.\]
\[\boxed{\mathbf{11.}}\]
\[121,\ 221,\ 321,\ 421,\ 521,\ 621.\]