K - 3 Learning Pages:
Resources for Kindergarten to Grade 3 teachers

Math - 100 Day

2learn.ca: 100 Days of School - http://www.2learn.ca/enjoy/100days/default.aspx Links

100th Day Activities - http://atozteacherstuff.com/Themes/100th_Day/  There tons of links here and some are great! You'll have to weed through the commercial sites, though, to find them all.

100th Day of School Activities - http://www.globalclassroom.org/100days.html Good ideas for grades 2-3.

100th Day of School - http://www.thevirtualvine.com/100thday.html  links and ideas

Beyond 100 Day - http://www.beyond100day.ecsd.net  Alberta teachers and students share activities for their 100 days-in-school celebration and how they extended the learning.

Enchanted Learning - 100 Day Theme - http://www.enchantedlearning.com/themes/hundred.shtml Again, I love the free printable book!

Little Giraffe's 100 Day - http://littlegiraffes.com/100day.html Excellent ideas for integrating the subject areas.

One Hundred Days Song - http://www.mrsjonesroom.com/songs/100days.html  Midi song to use, plus lyrics; also includes wonderful links to other sites.

Scholastic Teacher Ideas for 100 Day - http://teacher.scholastic.com/lessonrepro/100th/ Listed by subjects. Wow!

Pinterest 100 Days of School - https://www.pinterest.ca/joyteach/100-day-ideas/
Tip Junkie: 75 Clever Ideas for 100 Days of School - https://tipjunkie.com/ideas-for-100th-day-of-school/ Includes t-shirt ideas, and many more
KinderCraze - 100th Day of School - https://kindercraze.com/100th-day-of-school-ideas-for-kindergarten/ Love the fashion show. This is a blog with lots of ideas.
15 Unique 100 Day Projects - http://www.southshoremamas.com/?p=22223 pics of kids with their 100 day projects
25 Creative 100th Day Ideas - https://www.simplycircle.com/creative-100th-day-of-school-projects/ Fun ideas!
Education.com: 100th Day School Projects - https://www.education.com/slideshow/100th-day-of-school-project-ideas/ photos of cool ideas
Teach Junkie - 45 Best 100th Day Ideas - http://www.teachjunkie.com/holidays/45-best-100th-day-school-resources/ lots of photos, snack ideas
The Ultimate List of 100th Day Activities - http://www.teachjunkie.com/holidays/45-best-100th-day-school-resources/