100th Day!!
The 100th day of school is
cause for celebration!  Here are
a few of the ways we make that
day an unforgettable learning
experience:
We come to school dressed as 100 year-olds.
We make it our goal to collect 100 cans of food for a
local food bank.  The cans are numbered and lined up
in the hallway.
Students bring in collections of 100 things.  Then we
"put them to the test," naming the longest and
shortest collections, the heaviest and lightest
collection, the silliest collection, the softest (or
stickiest, smelliest, craziest, etc.).
We count to 100.... by 1's, 2's, 5's, and 10's..... at the
100th minute on the 100th day.
We make 100th day hats with numerals 1-100 pasted
all over them.
Teams of 4 students take turns writing the numerals
1-100 on adding machine tape.
We list 100 things we've learned so far!
Students write/copy 100 words.
We give students a blank grid with 100 squares.  
Students write their names one letter per square,
filling the entire grid (great for recognizing patterns).
Students go on a "100 hunt."  Before they arrive, we
number colored garage sale dots with numerals 1-100
and stick them all over the room.  Each student gets a
100 grid.  As they find the dots, they color the
corresponding numerals on their grids (another great
lesson in patterns!).
We make pictures using 100 paper pattern blocks.
We make necklaces using 100 Froot Loops, sectioned
by 10's.
We make our 100-year-old portraits by drawing our
faces on manilla paper... then crumpling them into
balls.  Once they're smoothed back out, the faces look
wrinkled.
Students use dice and a blank 100 grid to play the
next game. If a "6" is rolled, they color in the first 6
squares.  They keep rolling, counting, and coloring
until they reach the 100th square.
Literature
Miss Bindergarten Celebrates the 100th Day of Kindergarten by Joseph
Slate

Wolf's Chicken Stew by Keiko Kasza

The 100th Day of School by Angela Shelf Medearis  
Links
Mrs. Anderson's 100 Days of Kindergarten
100th Day Ideas