\[\boxed{\mathbf{217.}}\]
\[1)\ 250 + 50 = 300\]
\[380 + 20 = 400\]
\[2)\ 150 + 50 = 200\]
\[450 + 50 = 500\]
\[650 + 50 = 700\]
\[180 + 20 = 200\]
\[280 + 20 = 300\]
\[580 + 20 = 600\]
\[270 + 30 = 300\]
\[470 + 30 = 500\]
\[870 + 30 = 900\]
\[160 + 40 = 200\]
\[360 + 40 = 400\]
\[760 + 40 = 800\]