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When is the 100th Day of School? The 100th day of school varies from school to school, depending on
when school started and whether or not there are days off for teacher
workshops or inclement weather. Many schools end up celebrating the
100th day of school sometime in February. 
More than just a
milestone worth
noting  the 100th day is the perfect time to have fun with the number
100 while exploring counting, sorting, patterning, and various other
math skills and concepts. Try
some of the activities below, read the ideas submitted by classroom teachers, or share your own ideas using the submission form at the foot of the page. 
100 Object Sort 
Race for a Dollar 
Several of the above activities require that you prepare ziplock bags containing 100 small items ahead of time. Send home this letter a week or two before your 100th day activities and have students prepare these bags for everyone to use.
Favorite 100th Day ReadAlouds
For more
100th day ideas read the contributions below by visitors to our website. Share your own ideas using the submission form at the foot of the page.
Race to 100 and Number Grid Puzzles contributed by Maribel (New York)
Two of the center activities I've used the last few years on the 100th day
of school are Race to 100 and 100 Grid Number Puzzles.
Race to 100
Materials: 2 dice, 200+ craft sticks, 20 rubber bands, sentence frame
Players: 2 or more
1. Players take turns. For each turn, a player rolls the dice and picks up the
appropriate number of craft sticks.
2. Every time a player has 10 sticks, s/he bundles them with a rubber band.
When a player has 10 bundles of 10 sticks each, s/he puts a rubber band around
them to make a large bundle of 100. After each turn the player must say,
"I have __ tens and __ ones. I have ___ sticks in all" (I have this
sentence frame written on a card).
3. The game ends when one player reaches 100. Each player then counts his/her
total number of craft sticks and records the number.
100 Grid Number Puzzles: Ahead of time photocopy some completed 0100 number grids on card and laminate.
I try to copy each one on a different colored card to make it easier to manage
at cleanup time. Cut up the grids in different ways. Students work in the
center with a partner to put a puzzle back together. This activity creates lots
of good talk as partners discuss where the pieces should go. It is also a good
indicator of student's understanding of place value!
Roll to 100 contributed by Sarah (Tennessee)
Roll to 100 is always a popular activity in my class. All you need are a 100
grid for each player, 2 dice, and crayons of different colors. Directions are
as follows:
1. Each player estimates how many rolls it will take to reach 100.
2. Take turns rolling the dice and adding together the two numbers you rolled.
3. Color in that total number of squares on your hundred chart. Work in number
order and use a different colored crayon for each turn.
4. When you reach 100 count the number of rolls it actually took.
Our History One Hundred Years Ago contributed by Denise Yuse (Seabrook, NH. USA)
Go back 100 years in history and show students the changes that have been made throughout our culture. When I first did this the Girls Scouts organization was 100 yrs old. Fenway Park first opened. The potential is amazing and the discoveries are full of useful information. We discovered so much more about our town due to the town's historians' involvement with pictures. We made posters comparing then and now. It was so much fun. We printed everything we found online and sorted those photos into categories. The children went home with end products that were full of useful information.
Estimation/ Measurement contributed by Liz Finan (Fort Ashby, West Virginia)
I give each student a replica of a footprint. They record their name on the foot. Starting at a taped line on the hallway floor, they estimate how far 100 feet would be down the hall and tape their foot to the floor at that spot. I have a roll of 100 laminated feet each exactly 12 inches long. The master came from an old Everyday Math Resource book. We start at the taped line and unroll the line of feet and count as we go. We decide who had the best guess. It is always interesting how many students over estimate. Then we estimate and predict how long our class would be lined up head to foot, including teachers, along the line. We have also compared the length of our class with other rooms.
Kindergarten teacher contributed by Debbie (Texas)
My students and I do 10 different exercises 10 times. After each set of 10 ,
I write the number 10 on the board. When we are finished we go back and count
by tens to 100.
We also count to 100 everyday by 2s,5s, and 10s. We try to count by 10s
starting with a number other than 10 (ie,22,32,42...or 55,65,75,85,95...)
We also predict how far we can get from our classroom by walking 100 steps.
Then we go for a walk to find out.
I ask my colleagues to bring some of their collections from home to show the
kids. Then I read a book called Collections. After that I have the kids bring a
collection of 100 things from home to share and count by 10s.
We make a 100 poster and see how many different ways we can show 100 (ie one
hundred in words, 100 in numerals, 100 in sign language, 100 tally marks, 100
in Roman numerals, one hundred dots on dominoes, 100 using 10 frames...)
We count backwards from 1001 while passing a ball around the circle.
100th Day Dots contributed by Liz McCaw (Nanaimo BC)
Using a graphic organizer with ten sections spreading out from a circle on the centre of the paper, Kinders print 100 in the circle and then stamp ten dots with a bingo dobber in each section.
100th Day Tshirt contributed by Betty Barnes (Michie, Tn)
The students and parents glue, sew, or draw 100 items on a T shirt.
100 Days Smarter contributed by K teacher
I like to use a sentence strip for a crown and have students decorate and write Happy 100th day! Or I'm 100 days smarter.
100 Pennies contributed by Klondike Apples (Louisville, KY)
Each student is encouraged to collect 100 pennies throughout their house, car, etc. On the 100th day, they put each penny on a hundreds chart to actually count their pennies. Parents love this becaue they don't have to find 100 misc. objects. The students compete to see which table (of 6) collects the most pennies. The money is used for books, crafts, snack, or whatever our class needs. (This year it will be glue sticks!)
100 Tally Marks Game contributed by Meenal (North Olmsted, Ohio)
This is not an original creation, but it is one that our students love to
play!
We have a laminated game board with 20 groups of five dots each. These dots are
where tally marks would start (4 on top and 1 off to the side). Two students
roll a die and make as many tally marks as they roll. They take turns using two
different colored dry erase markers. This keeps going until the board gets
completely filled up and 100 tally marks are made. The player who puts the
100th tally mark on is the winner.
Estimation Jar contributed by Rebecca (Philadelphia)
Love all the ideas on this page! Two partner activities that I've used in
3rd grade are:
1. How tall is a stack of 100 pennies? 100 nickels? The coin of your choice?
Students work together to stack the coins and then need to decide which
measuring tool to use to measure their stack.
2. Each letter of the alphabet is assigned a point value. A=5, B=2, C=3 etc.
Students work with a partner to write as many words as they can that equal 100
points.
We also usually do an estimation jar activity. Before the kids arrive I fill
three clear plastic jars with objects of the same type (one year I used
popcorn, another year I used small marshmallows). In one jar I put 100 items,
in another jar more than 100, and in a third jar less than 100. I label each
jar Jar A, Jar B, Jar C. Students estimate which jar has exactly 100 items.
Then they graph their guess with a postit. At the end of the day the jar with
100 objects is revealed and the kids calculate how to share the contents
equally. The jar contents are then shared and eaten. The kids love this part!
Ice Melt contributed by Melissa Hejmanowski (Buffalo, New York)
I put 100 ice cubes in a jar and the students have to guess where
they think the water line will be when all the ice melts. Whoever is the
closest wins a prize.
My Autograph Book contributed by Lorraine (Middleton, New York)
We make a booklet for each child and they try to collect 100 signatures by the 100th day of school. We usually start around the 96th day. They have fun asking each other and other staff members for their autograph.
Do you have a great 100th day activity? Share it!