no, 330 -/+ 180 so 150.
note that as a quick check the digits ogfthe two add up to the same thing (6). A useful mathematical fact about reciprocal headings.
just realized theres an exception: 000-009 and 180-189. The relation comes from being the same modulo 90. If you use tens of degrees ( as with runway headings) and call north 36 instead of 0 it holds.