First, you'll need a rockin' 100th Day t-shirt! Mrs. Gilchrist has a free download for this t-shirt and directions on how to make your own! {You'll need to scroll way down to find this...she also has a download to make a t-shirt for the grade you teach!} Sweet right?!?
Sarah at Sarah's First Grade Snippets has a science activity and a measurement activity!


How cute are these glasses from Technology Rocks. Seriously.
I love this idea from Langston's Learners. The children create a picture from a die cut of number 100.
How adorable would your students look if they dressed up like they were 100 years old? Mrs. Jump has a parent letter about having the students dress up!
Abby at The Inspired Apple has a cute art activity! These 100 year olds are super cute!
I love this idea of having the students draw a portrait of themself now and in 100 years form Teach Kids Art.
Amy at Step Into 2nd Grade with Mrs. Lemons has a cute 100's chart activity!
I love this idea of 100 acts of kindness! What a great way to build self-esteem and teach good character traits! This idea is from Mrs. Zimmerman.

I love this poster from First Grade Frenzy!
What are you going to do for the 100th Day of School?