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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, measuring and various other
math skills and concepts. Try
some of the activities below, scroll down to read ideas submitted by classroom teachers, or share your own ideas using the submission form at the foot of the page. 
Several of the activities below require ziplock bags containing 100 small items. Send home this letter a week or two before your 100th day activities and have students prepare these bags for everyone to use.
100 Object Sort How Many Different Ways Can You Count to 100? 
Name Patterns on the 100 Grid 
Favorite 100th Day ReadAlouds
For more
100th day ideas read the contributions below made 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.
100 Exercises 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.
100th Day Candy Scavenger Hunt contributed by Jane Ryan (First Grade Teacher, Fort Collins, Colorado)
Label 100 pieces of Hershey miniature candies with the numbers 1100. Before school on the 100th Day hide the candy throughout the room. Provide a brain break/scavenger hunt several times during the day. Each time children hunt for candy, they are allowed to find one piece. The children take the piece of candy and place it on a large poster sized 100 chart. Hopefully, all pieces are found by the end of the day.
On the 45 days following the 100th day (depends on how many students in your class), give each child one piece of the candy. Have them record/show the number on the candy with money, tally marks, base ten blocks, or number sentences (+ or ).
100th Day Fraction Art Masterpiece contributed by Ms. Bobby Shavon Butler (Atlanta, Georgia)
Beforehand, cut various colors of construction paper into small to medium pieces. Have each student create a design using 100 pieces by gluing them onto a piece of construction paper or blank paper. They may title their art work. Afterwards, have them write a fraction for each color and have them add it all up. This can be done on a blank area where the design is. If they do it correctly, their total should be 100/100 or 1 whole. This will also give them practice or review on adding fractions and decomposing fractions.
100th Day Snack, contributed by Kelli Pierson (Lucedale, MS)
One of my favorite 100th day activities is our special snack. We have 10 treats (Honeycombs cereal, M&M's, Goldfish, marshmallows, etc.) set out on paper plates. Students count 10 of each item and place in their ziptop baggies. When they are finished, they have 100 items in their bag, and a great snack!
100 Appreciations, contributed by Diana Bamper (Mesa, AZ)
We work together to write 100 appreciations for staff and other students in our school. Ex: "I really appreciate how Isaiah always shares his crayons with me" "I appreciate how Mr. Alger always gives out a Caught Being Good at P.E. We decorate our door or a large poster board and write our appreciations on small cutout hearts. The title of our door is, "WE JUST LOVE APPRECIATIONS!" "Our 100 Appreciations"
What's it Going to Be?, contributed by Jessie Addison (Darlington, South Carolina)
I give each of my first grade students 100 dried beans or dry cereals, a white sheet of construction paper or card stock, bottle of glue, and markers or crayons. Students are told to brainstorm and think of something they would like to create with the beans or cereal. Students have created buildings, animal shapes, flowers, and airplanes. It's amazing to see their creative art pieces.
100 Day Puzzle Race, contributed by Mrs. Jones (Rogers Co. Oklahoma)
I divide my classroom into groups of four. I give each group a puzzle with 100 pieces. Ready, set, go! The group that finishes their puzzle first, wins.
The 100 Kernel Popcorn Challenge, contributed by Lillian Dennis, Big Sur, California
After numbering a 100's chart, each student counts out 100 kernels of popcorn. Depending on the size of your class,you may break your class into ten groups if possible, so that further exploration can occur with base 10 activities. Then students estimate how many of those kernels will pop. This is a good time to introduce percentage. If they think every kernel will pop, they will have 100%. If they think only 91 kernels will pop, they will have 91% etc.
You could also talk about division. If every student or group gets the same amount of kernels, How many kernels will each student get?
Next pop the popcorn to see how close there estimation was. In the end as a follow up, make caramel corn. Yummy, educational and fun!
Do you have a great 100th day activity? Share it!