The Middle Kingdom comprises two phases, the 11th Dynasty, which ruled from Thebes and the 12th Dynasty onwards which was centred around el-Lisht. These two dynasties were originally considered to be the full extent of this unified kingdom, but historians now consider the 13th Dynasty to at least partially belong to the Middle Kingdom.
Click here and use the associated link to answer the questions on your webquest under the section "The End of the Middle Kingdom"