It is design challenge day. 
Build a Frog House
Challenge: Work with a partner and take 32 base ten blocks.  You may take any combination of hundreds, tens and ones.  You must use all of your blocks to build a frog house.  Guess the value of your house.  Then count the blocks and find the true value of your house.  Congratulations to Ian and Levi.  What a frog house.