Make your 100th Day of School celebration meaningful (and manageable) for older kids with these 100th Day of School STEM Mini-Challenges! These 100th Day STEM activities are designed specifically for grades 3-5 and include 10 fun and engaging 100th Day-themed STEM challenges with student recording sheets, scoring rubrics, and teacher guides.

Students build, test, measure, record, improve, and reflect using simple classroom materials. Keep engagement high with quick, hands-on builds, testing, and improvement. Everything is print-and-go!

⭐ Unlike many 100th Day resources created for younger students, this set focuses on real learning while still making the day fun and memorable. Use the activities as centers or stations, or pick and choose the challenges that best fit your class.

Want a full 100th Day plan? Grab the BUNDLE (academic printables + STEM) and save money!

100th Day of School Activities STEM Challenges for 3rd 4th 5th Grade BUNDLE

Included in this download:

• 10 printable STEM Mini-Challenge Cards (each designed for about 10–20 minutes)
• Fast Version + Level Up options on every challenge card
• 10 student recording sheets (one per challenge)
• 1 optional generic recording sheet (works with any challenge)
• Teacher guide page (materials list, setup tips, timing suggestions)
• Scoring rubric for teachers

Perfect for:

• 100th Day STEM activities during center rotations or stations
• A quick STEM block when you need something structured and ready
• Sub plans, enrichment groups, and fast-finisher extensions
• Team-building practice (roles + collaboration + reflection)

Why teachers love this resource:

Planning a 100th day activity for older students can turn into a scramble! Either the tasks feel too young, or they require a ton of prep. This set solves that by giving you print-and-go, classroom-material-friendly challenges with built-in structure (goal, materials, rules, success criteria, quick extension, and a short, fast option). Students don’t just “do” an activity—they plan, test, record results, improve, and reflect, all in one place.

The best part:

Every challenge includes differentiation without extra planning:

• Fast Version for tight schedules
• Level Up for students who finish early
• Recording sheets that guide students through real STEM thinking (and make assessment easy)

If you want 100th Day STEM challenges that are truly made for grades 3–5, this is your go-to. Print the cards and recording sheets, set out simple supplies, and let your class jump into high-engagement 100th Day of School STEM learning with minimal prep!

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