Looking for easy STEM activities for kids that don’t require expensive kits or complicated prep? This page features some of the best low-cost STEM activities and STEM projects for kids, using simple household materials you already have.
How to Set Up Easy STEM Activities for Kids
These hands-on science, technology, engineering, and math activities work well for kindergarten, elementary, and middle school students, whether you’re teaching in a classroom, homeschooling, or planning screen-free learning at home.
Grades: K–8
Best for: Classrooms, homeschool, after-school programs, and learning at home
💡 Low-cost STEM activities don’t mean low-quality learning. In fact, many of the best STEM activities for kids use everyday materials like recyclables, pantry staples, and basic craft supplies.
With just a few core items, kids can explore:
- chemical reactions
- physics and motion
- engineering design
- problem solving and logical thinking
To simplify planning, grab the Must-Have STEM Supplies List (free printable). It helps keep STEM projects ready to go with minimal prep and flexible materials.
These hands-on STEM activities are ideal for:
- classrooms
- homeschool groups
- STEM clubs
- screen-free learning at home
STEM Concepts Explored in This Post
This collection of STEM activities introduces kids to foundational ideas across multiple STEM fields, including:
- Chemical Reactions and Properties of Matter
- Polymers and Material Science
- Energy and Motion
- Engineering Design and Problem Solving
- Magnetism
- Logical Thinking and Math
- Environmental and Earth Science
- Simple Machines and Mechanical Systems
- Screen-Free Coding and Algorithms
Top Simple STEM Activities for Kids
These easy STEM activities use simple, low-cost materials and can be adapted across grade levels. Each activity works well as a stand-alone lesson or as part of a larger STEM unit.
Baking Soda and Vinegar Experiments
Explore the chemical reactions of baking soda and vinegar through classic activities such as balloon inflation and volcano eruptions.
Elephant Toothpaste (Foaming Reaction)
Elephant toothpaste is a dramatic experiment that shows how chemical reactions release energy and gas.
Invisible Ink for Secret Messages
Write secret messages using lemon juice and reveal them with heat to explore oxidation.
Sink or Float Investigation
A sink float experiment tests everyday objects to explore density, buoyancy, and material properties.
Homemade Slime
Create homeade slime to explore polymers, viscosity, and material properties.
Milk Plastic (Casein Plastic)
Turn milk into plastic to introduce polymers and materials science.
Floating Magnet Investigation
This floating magnet activity uses magnet wands, paperclips, and fun paper cutouts that work well for classrooms or homeschool settings and can be used again and again for multiple STEM lessons.
Marble Roller Coaster Engineering Project
Design a marble track using cardboard tubes or pipe insulation to investigate motion and energy.
Popsicle Stick Chain Reaction Engineering Project
Explore stored energy and cause-and-effect through an popsicle stick engineering build.
Bottle Rocket Activity (or Straw Rockets)
Launch rockets using air pressure and water, or try a simplified straw version for younger students.
STEM Focus: Physics, air pressure, propulsion
Parachute Design Engineering Activity
Design a parachute to slow a falling object and explore air resistance.
Paper Bridge Engineering Project
Build a bridge using paper and tape to support weight and explore forces and structures.
Tower Building Engineering Project
Design the tallest or strongest tower using limited materials.
Simple Machines Projects
Explore simple machines. Build a catapult, pulley, winch, or Archimedes screw using household materials.
Ice Cream in a Bag
Make ice cream while learning how salt lowers the freezing point of water.
Crystal Growing Experiments
Grow crystals to explore solutions, saturation, and crystallization.
Alka-Seltzer Experiments
Explore gas production, density, and chemical reactions with simple Alka-Seltzer activities.
Pizza Box Solar Oven
Harness solar energy to heat food using a homemade solar oven.
Screen-Free Coding Activities
Explore algorithms and binary code without screens.
Water Cycle in a Bag
Create a visual water cycle model of evaporation, condensation, and precipitation.
💡 Looking for fast, time-based ideas? You can also explore our quick STEM challenges and activities for short class periods or group games. Focus: Coding, logic, problem solving
FREE Printable STEM Activities Guide!
Get your free printable 5 Day STEM activities pack to get started today.
STEM Activities for Kids – FAQ
Q: What are STEM activities for kids?
A: STEM activities for kids are hands-on projects that explore science, technology, engineering, and math through building, experimenting, and problem solving.
Q: What are easy STEM activities for kids?
A: Easy STEM activities include baking soda reactions, slime experiments, sink or float investigations, simple machines, and basic engineering projects using household materials.
Q: Are STEM activities good for kindergarten?
A: STEM activities are great for kindergarten when they focus on exploration, observation, and simple cause-and-effect.
Q: Do STEM activities need special supplies?
A: STEM activities do not require special supplies. Many use common household items such as baking soda, vinegar, recyclables, paper, tape, and craft sticks.
Q: Can STEM activities be used in the classroom?
A: STEM activities work well in the classroom because they are low-prep, hands-on, and encourage critical thinking and collaboration.
STEM Resources to Support Hands-On Learning
Want to go deeper or build a structured STEM routine? These resources support vocabulary, engineering thinking, and reflection—without adding extra prep.
- Engineering Design Process Explained
- Scientist Vs. Engineer
- Engineering Words
- Questions for Reflection (get them talking about it!)
- BEST STEM Books for Kids
- 14 Engineering Books for Kids
- Jr. Engineer Challenge Calendar (Free)
- Must Have STEM Supplies List
- Scientific Models You Can Make
Printable Science Packs for Kids
Visit our SHOP for easy-to-print STEM and science lesson plans for the whole year. Or join us in the Little Bins Club.
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