\[\boxed{\mathbf{Вариант\ 1.}}\]
\[\boxed{\mathbf{1.}}\]
\[698,\ 699,\ 700,\ 701.\]
\[\boxed{\mathbf{2.}}\]
\[899 + 1 = 900\]
\[529 + 1 = 530\]
\[340 - 1 = 339\]
\[600 - 1 = 599\]
\[198 + 1 = 199\]
\[209 + 1 = 210\]
\[\boxed{\mathbf{3.}}\]
\[348 = 300 + 40 + 8\]
\[509 = 500 + 9\]
\[\boxed{\mathbf{4.}}\]
\[2\ дм = 200\ мм\]
\[315\ см = 3\ м\ 15\ см\]
\[2\ дм\ 7\ мм = 207\ мм\]
\[68\ дм = 6\ м\ 8\ дм\]
\[360\ см = 36\ дм\]
\[49\ м = 490\ дм\]
\[\boxed{\mathbf{5.}}\]
\[608 < 806\]
\[243 < 253\]
\[762 > 672\]
\[540 > 450\]
\[\boxed{\mathbf{6.}}\]
\[400 + 70 + 7 = 477\]
\[576 - 70 - 6 = 500\]
\[741 - 40 = 701\]
\[830 - 800 = 30\]
\[324 - 24 = 300\]
\[609 + 30 = 639\]
\[\boxed{\mathbf{7.}}\]
\[456 + 1 = 457 = 400 + 50 + 7\]