The answer is 280°. To arrive at this result, recall the formula for coterminal angles of 1000°: 1000° + 360°×k. Clearly, to get a coterminal angle between 0° and 360°, we need to use negative values of k. For k=-1, we get 640°, which is too much. So let's try k=-2: we get 280°, which is between 0° and 360°, so we've got our answer.