\[\boxed{\mathbf{184.}}\]
\[1)\ 350 + 200 = 550\]
\[350 - 200 = 150\]
\[2)\ 410 + 200 = 610\]
\[410 - 200 = 210\]
\[640 + 300 = 940\]
\[640 - 300 = 340\]
\[560 + 400 = 960\]
\[560 - 400 = 160\]