15+ Easy STEM Projects to Make at Home for Primary School Children Easy STEM projects help children learn science through hands-on experience Easy STEM projects help children explore science through simple models at home. This article suggests 15+ projects suitable for primary school children, with easy-to-find materials, short steps and follow-up questions so your child can explain what is happening for themselves. What is an easy STEM project? An easy STEM project is a simple model or experiment that helps children learn about science, technology, engineering and mathematics through hands-on activity. A true STEM project needs a clear scientific principle, a trial-and-error stage and should help children explain why the project works. The difference lies in the thinking process. Children don’t just cut and stick from a template; they have to observe, ask questions, experiment and adjust their project after each attempt. STEM combines science, technology, engineering and mathematics in one learning activity 4 criteria for a good STEM project So that parents don’t confuse STEM with crafts, it is important to look at the learning goal behind the project. A simple model is still valuable if children understand the phenomenon and know how to improve it after testing. A STEM project for primary school children should meet the following criteria: It includes at least two STEM elements: The project should combine science, technology, engineering or mathematics. For example, a self-watering device combines observing water, designing small holes and testing how fast the water drips. It has a clear scientific principle: Children need to be able to name what is happening, whether that is thrust, a chemical reaction, evaporation, an electrical circuit or heat transfer. It includes trial and error: A good STEM project doesn’t need to be perfect straight away. Children should be able to change materials, adjust proportions, try again and observe different results. Children can explain it in words: If children finish a project but don’t understand why it works, the activity hasn’t yet achieved the spirit of STEM. This approach fits the spirit of the IB Primary Years Programme (PYP), in which students are encouraged to explore actively, ask questions and gradually build understanding through learning experiences, rather than simply following ready-made answers. How is STEM different from crafts? Crafts and STEM activities may both use paper, scissors, glue or recycled materials. However, STEM doesn’t stop at a nice-looking product; it focuses on questions, principles and how children improve their work themselves. Criterion Crafts STEM Main goal Create a nice product that matches the model Answer a scientific question Process Follow fixed steps Make a hypothesis, test, observe, adjust Role of mistakes To be avoided; redo it to match the model Data for improving next time Parent’s question “Have you finished?” “Why do you think it works like that?” What is measured The final product How your child thinks The product may not look perfect, the water filter may drain slowly or the model may be lopsided. But if your child can explain why that happened, the STEM session has achieved its most important goal. 15+ easy STEM projects grouped by science area The projects below are grouped by science area so parents can easily choose based on their child’s interests and age. Each project should be treated as a small project in its own right, with materials, steps and follow-up questions once it is finished. Most projects are suitable for children in Grades 2 to 5 and don’t need a big budget. Parents can start with plastic bottles, cardboard, rubber bands, vinegar, bicarbonate of soda or a few basic electrical components. A suggestion table to help parents choose STEM projects by age and time Physics and mechanics This group helps children observe forces, motion and energy. The projects are usually easy to make, low-risk and suitable for weekend sessions at home. Balloon-powered car (ages 7–10, 20 minutes) Scientific principle: Air escaping in one direction creates a push in the opposite direction. This is a simple way for children to get to know motion and thrust. Materials: 1 balloon, 1 straw, 4 bottle caps, 1 piece of cardboard, sticky tape, skewers or small axles for the wheels. Steps: Cut the cardboard into a rectangle for the car body. Attach the 4 bottle caps as wheels. Tape the straw onto the car body, pointing towards the back. Attach the balloon to the straw and blow it up. Place the car on the floor, let go and observe. Follow-up question: If you blow the balloon up bigger, will the car go further? Try measuring the distance to check. Mini cable car (ages 8–11, 30 minutes) Scientific principle: This project helps children understand tension, slope and gravity. When the string slopes, the cabin slides from the high point to the low point. Materials: 2 tall chairs, 2 m of parachute cord, 1 small cardboard box, sticky tape, 2 paper cups or weights to hold the supports steady. Steps: Place the 2 chairs about 1.5 m apart. Tie the cord between the 2 chairs. Set one end of the cord higher than the other. Make 2 holes in the box and thread the cord through. Watch the cabin slide from the high point to the low point. Follow-up question: If you want the cabin to move more slowly, would you change the slope or the weight of the cabin? Rubber band-powered boat (ages 8–11, 25 minutes) Scientific principle: A rubber band stores elastic energy when it is twisted. When released, that energy turns the paddle and pushes the boat forward. Materials: 1 light piece of foam, 2 lolly sticks, 1 large rubber band, 1 basin of water, scissors and sticky tape. Steps: Cut the foam into a small boat shape. Attach the 2 lolly sticks in parallel at the back of the boat. Cut a small paddle from foam. Fix the paddle into the rubber band between the 2 sticks. Wind up the paddle and put the boat in the water. Follow-up question: If you twist the rubber band more, will the boat go for longer or faster? Why? Paper robot hand (ages 9–11, 45 minutes) Scientific principle: This model helps children understand joints, pulling forces and simple control mechanisms. When the string is pulled, the straw sections bend like a moving finger. Materials: 5 thick straws, 1 cotton string, 1 wooden tongue depressor, sticky tape, scissors. Steps: Cut the straws into short sections. Join the sections to make a finger with joints. Thread the cotton string through the straw sections. Attach the finger to the tongue depressor. Pull the string to make the finger bend. Follow-up question: How many joints does your real hand have? What is this model missing? Physics and mechanics projects help children observe forces and motion Chemistry and reactions This group often creates a sense of surprise, which makes it great for sparking initial interest. Parents need to supervise children, especially in experiments involving hydrogen peroxide, heat or foaming reactions. Bicarbonate of soda volcano (ages 6–9, 15 minutes) Scientific principle: Vinegar is acidic and bicarbonate of soda is a base. When the two are mixed, the reaction produces carbon dioxide (CO₂), which makes foam overflow from the top of the bottle. Materials: 1 small plastic bottle, 3 teaspoons of bicarbonate of soda, 100 ml of white vinegar, a few drops of washing-up liquid, red food colouring, clay or sand to shape the volcano. Steps: Place the plastic bottle in the middle of a tray. Mould clay around the bottle into a volcano shape. Put the bicarbonate of soda into the bottle. Add the red colouring and washing-up liquid. Pour the vinegar into the bottle and watch the foam overflow. Follow-up question: If you use lemon juice instead of vinegar, will the volcano still foam? Why? Elephant toothpaste (ages 8–11, 20 minutes) Scientific principle: Yeast helps hydrogen peroxide break down faster and release oxygen. The soapy bubbles trap the gas, forming a huge column of foam that looks like giant toothpaste. Materials: 1 tall-necked plastic bottle, 100 ml of 6% hydrogen peroxide, 1 teaspoon of washing-up liquid, 1 sachet of dried yeast, 50 ml of warm water, food colouring, safety goggles. Steps: Put the hydrogen peroxide, colouring and washing-up liquid into the bottle. Mix the yeast with warm water in a separate cup. Pour the yeast mixture into the bottle quickly. Step back and watch the foam rise. Gently touch the outside of the bottle to feel the heat. Safety note: 6% hydrogen peroxide can irritate skin and eyes. An adult needs to help directly when pouring the solution. Follow-up question: Is the foam in the bottle warm or cold? Where do you think that energy comes from? Invisible ink from lemon juice (ages 7–10, 20 minutes) Scientific principle: Lemon juice contains a weak acid. When heated, the parts of the paper with lemon juice on them oxidise and turn brown faster. Materials: 1 lemon, 1 small bowl, 1 cotton bud, white paper, a lamp with a hot bulb or an iron. Steps: Squeeze the lemon to get the juice. Dip the cotton bud in the lemon juice. Write a message on the white paper. Wait for the paper to dry completely. Hold the paper near a heat source so the writing appears. Follow-up question: Apart from lemon, which other liquids in the kitchen could make invisible ink? Chemistry and reactions projects help children observe phenomena through supervised experiments Biology and the environment This group connects STEM with everyday life, helping children understand clean water, plants, weather and natural cycles. It is a good fit for Grade 4–5 students who are studying a lot of practical science. Mini water filter (ages 8–11, 30 minutes) Scientific principle: Each layer of material traps particles of a different size. Children can observe how the water changes after passing through gravel, sand, activated charcoal and cotton wool. Materials: 1 1.5-litre plastic bottle, small gravel, clean sand, activated charcoal, cotton wool, 1 glass, dirty water made from soil and dry leaves. Steps: Cut off the bottom of the plastic bottle and turn it upside down. Plug the neck of the bottle with cotton wool. Add layers of activated charcoal, sand and gravel in turn. Make dirty water using water, soil and dry leaves. Pour the dirty water into the bottle and watch the water that comes out. Follow-up question: Is the filtered water safe to drink yet? If not, what other step would be needed? Self-watering plant bottle (ages 7–10, 15 minutes) Scientific principle: Water drips slowly through small holes in the bottle cap. Children can observe how the flow rate changes with the size of the holes and how moist the soil is. Materials: 1 500 ml plastic bottle, 1 needle, 1 potted plant, clean water. Steps: Use the needle to make a few small holes in the bottle cap. Fill the bottle with water. Screw the cap on tightly. Push the bottle upside down into the soil near the plant. Track the water level over a few days. Follow-up question: How will the bottle empty differently on sunny days and rainy days? Terrarium in a jar (ages 8–11, 40 minutes) Scientific principle: A terrarium simulates the water cycle. Water vapour rises, condenses on the sides of the jar and falls back down like light rain. Materials: 1 glass jar with a lid, small gravel, activated charcoal, potting soil, moss, succulents or mini ferns, a spray bottle. Steps: Spread gravel on the bottom of the jar for drainage. Add a thin layer of activated charcoal. Add the potting soil to the jar. Plant the small plants in the soil. Mist lightly with water and put the lid on. Follow-up question: Why doesn’t a terrarium need watering every day? Homemade thermometer (ages 9–11, 25 minutes) Scientific principle: Liquids expand when heated and contract when cooled. Children can observe the level of liquid in the straw changing with temperature. Materials: 1 small glass bottle, water and rubbing alcohol, food colouring, 1 clear straw, clay, a bowl of hot water and a bowl of iced water. Steps: Pour the mixture of water, alcohol and colouring into the bottle. Insert the straw so the bottom end is in the liquid. Seal the neck of the bottle with clay. Place the bottle in the bowl of hot water. Move the bottle to the bowl of iced water and observe. Follow-up question: If you wanted to add a temperature scale, how would you work out where to mark 30°C? Biology and environment projects connect STEM with clean water, plants and nature Engineering and technology This group is more challenging and suits Grade 4–5 students who are already used to simple experiments. Parents should help when children use batteries, wires, craft knives or hot glue. Simple circuit with AA batteries (ages 9–11, 30 minutes) Scientific principle: When a circuit is closed, electric current flows and the light comes on. When the circuit is open, the current stops and the light goes off. Materials: 2 AA batteries, 1 battery holder, 1 small LED, copper wire, 1 paper clip, electrical insulating tape. Steps: Connect the positive terminal of the battery to the long leg of the LED. Connect the short leg of the LED to the negative terminal. Watch the LED light up when the circuit is closed. Attach the paper clip in the middle of the wire as a switch. Open and close the paper clip to turn the light on and off. Follow-up question: If you add another AA battery, will the light get brighter or be more likely to burn out? LED traffic light (ages 10–11, 60 minutes) Scientific principle: This is an upgraded version of the basic circuit. Children learn how to design a product with a clear real-life function. Materials: 1 cardboard box, 3 LEDs (red, amber and green), 3 220 Ω resistors, 1 9 V battery holder, wires, 1 three-position switch. Steps: Make 3 holes in the box in the order red, amber, green. Fit each LED into the correct hole. Connect each LED to a resistor to protect it. Connect the wires to the switch and battery holder. Test each light, then decorate the box as a traffic light. Follow-up question: Why do traffic lights use fixed colours in so many countries? Storm-proof house model (ages 9–11, 45 minutes) Scientific principle: This project helps children understand structures, wind force and resilient design. There is no single right answer, only a better version after each attempt. Materials: Cardboard, straws or lolly sticks, glue gun sticks, 1 electric fan, a small weight for the foundation. Steps: Sketch the frame of the house before cutting materials. Use lolly sticks or straws to build the main supports. Strengthen the edges with diagonal braces to make it more stable. Place a small weight inside as a foundation. Use the fan to test how strong it is and record the results. Follow-up question: Why are triangular frames usually more stable than square ones? Periscope (ages 9–11, 40 minutes) Scientific principle: Two mirrors placed at the right angle change the direction of light. This is the basic principle of periscopes used for observation. Materials: 1 long milk carton, 2 small mirrors, a ruler, a craft knife, sticky tape. Steps: Cut 2 angled slots at each end of the carton. Cut 2 windows opposite each slot. Fix the mirrors into the slots at an angle. Make sure the reflective sides face inwards. Look through the lower window and observe the image. Follow-up question: If the carton were longer, would the image be clearer? Engineering and technology projects introduce children to circuits and design STEM projects from recycled materials As well as the 15 projects above, parents can make use of old materials to create more quick STEM activities at home. This group is ideal when families want to combine science with environmental education. Three ideas to get started quickly: Mini cardboard box guitar: Rubber bands stretched over a box make sounds, helping children understand vibration and resonance. Self-watering pot from a plastic bottle: A fabric wick draws water from the bottom section up into the soil, helping children observe how water moves. Vibrating robot from an old toy motor: An off-centre weight on the motor shaft creates a vibrating movement, helping children understand unbalanced motion. These ideas show children that STEM doesn’t depend on expensive kits. Westlink students have also taken part in an activity turning waste into artworks, transforming old materials into creative products with real learning value. Recycled STEM projects help students combine creativity with environmental awareness 5 mistakes parents often make when doing STEM with their child Many parents start with good intentions but unintentionally turn STEM into a craft activity with a ready-made answer. Here are the mistakes to avoid so that children genuinely get to observe, experiment and explain for themselves. Doing it for your child to save time: When parents do all the cutting, sticking and fixing, children are left just watching. Let your child make mistakes, then ask: “What would you like to change next time?” Focusing only on how the product looks: A lopsided water filter that your child understands layer by layer is worth more than a beautiful model they can’t explain. STEM should be judged on thinking, not just appearance. Not asking “why?” and “what if?”: The question “Have you finished?” tends to close the conversation. Try “Why do you think it works?” or “What if you used a different material?” instead. Choosing projects that are too difficult: Younger children can easily lose heart if they start with robots, complex circuits or kits with lots of parts. Choose projects that take 15–30 minutes before increasing the challenge. Skipping the presentation step: When children explain their project, the knowledge becomes clearer in their minds. Parents can ask their child to give a 1-minute presentation to their grandparents or record a short video. If your child isn’t interested in STEM, the problem usually isn’t STEM itself but how the project was chosen. Start with something your child loves, such as plants, cooking, toy cars or animals, and turn that interest into a question to explore. 5 mistakes parents often make when doing STEM projects with their child A 4-week plan for doing STEM at home A 4-week plan helps parents get started with STEM gently, without choosing projects that are too difficult from the start. Each week, one 45–60-minute session is enough, suitable for children in Grades 2 to 5. Week Goal Suggested project Guiding question Week 1 Observe a phenomenon Bicarbonate of soda volcano What did you notice changing? Week 2 Understand a principle Balloon-powered car Why does the car move? Week 3 Solve a problem Mini water filter How can we make the water clearer? Week 4 Present a project A project your child chooses What would you like to improve? In the first week, parents don’t need to explain too much. The aim is for children to see that science can appear in familiar, fun and easy-to-observe phenomena. From the second week, encourage your child to measure, compare and record results. When children have data, the question “why?” comes up more naturally rather than being a prompt from their parents. By the final week, your child should choose a project to present. When they can say what problem the project solves, how they tested it and what they want to improve, they have completed a small STEM cycle at home. A 4-week plan makes it easier for parents to do STEM at home How do Westlink students learn STEM? When learning STEM at school, children don’t just complete a model. They are guided to ask questions, experiment, present ideas and receive feedback from teachers, classmates or the community. If STEM activities at home help children observe and learn through trial and error, the school environment helps them go further. At Westlink, students are guided to ask questions, form hypotheses, experiment and present their ideas through inquiry-based learning activities. Westlink is an international school authorised to deliver the IB Primary Years Programme (PYP). In this inquiry-based learning environment, students are encouraged to learn through experience, connect knowledge to real situations and confidently present what they have found out. The STEM Fair is an annual event at Westlink International School STEM activities at Westlink At Westlink, STEM is delivered through a range of hands-on activities and experiences that help students apply their knowledge to real situations. Some notable activities include: STEAM Fair 2026: Students choose a problem, develop a product and present their learning process to the community. The focus isn’t only on the final product, but also on the questions, experiments and lessons learnt. Secondary STEM Fair: Secondary students take part in more complex hands-on projects. This activity helps them practise defending their ideas and responding to feedback. Grade 5 trip to Lotte World Aquarium: Students extend their learning beyond the classroom by observing marine life and exploring ocean conservation. This is how STEM connects with the real living world. Why is this way of learning different? Many STEM ideas for students stop once the product is finished. Inquiry-based learning asks children to go one step further: connecting their product to a bigger question about the world around them. A mini water filter isn’t just a model for watching water become clearer. It can open up questions about clean water, community health and how people design solutions to real problems. Parents can find out more about the approach to learning at Westlink to see how the school organises exploration, hands-on activities and project presentations for students. Easy STEM projects at home help children develop their ability to observe, experiment and explain what they see. If you want your child to learn in more depth, in an environment with teacher guidance, hands-on activities and opportunities to present projects, Westlink International School is well worth exploring. Here, primary students engage with STEM through experience, inquiry and critical thinking in the PYP. Book a tour of Westlink to see the learning environment for yourself.
