STEM Substitute Teacher Guide
Practical classroom strategies, lesson plan tips, and emergency lesson ideas for substitute teaching stem.
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Strategies
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Lesson Tips
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Emergency Ideas
Substitute Teaching STEM
Substitute teaching stem can feel intimidating, especially if it's not your area of expertise. The good news is that most stem classes will have lesson plans left by the regular teacher, and your primary job is to facilitate — not to be the expert. Here's how to succeed.
Key Classroom Strategies
Emphasize the engineering design process: ask, imagine, plan, create, improve
Let students struggle productively before stepping in with solutions
Encourage documentation of the process, not just the final product
Use teamwork with assigned roles (materials manager, recorder, timekeeper) to keep groups productive
Frame failure as iteration rather than a bad outcome
Lesson Plan Tips
Check what materials and tools are available and prep them before class starts
Set a clear time limit for building or experimenting phases with visible countdown
Have students sketch their designs before building to encourage planning
Build in time for testing and sharing results at the end of class
If students use technology, make sure devices are charged and software is accessible
Common Challenges
Students jumping straight to building without planning or thinking through their design
Managing expensive materials, tools, or technology you're unfamiliar with
Uneven participation in group projects where one student does all the work
Open-ended projects that can spiral without clear time and scope boundaries
Emergency Lesson Ideas for STEM
No lesson plan? No problem. Keep these ideas in your substitute teacher toolkit:
Paper bridge challenge: build a bridge from paper and tape that holds the most weight
Egg drop design challenge using only classroom materials
Tower building contest with limited supplies (marshmallows and spaghetti, index cards, etc.)
Rube Goldberg machine design on paper with at least five steps
Reverse engineering: students take apart a simple object and diagram its components
Frequently Asked Questions
Related Resources
Become a Better STEM Sub
Our training courses cover classroom strategies for all subjects, including stem.