Paper STEM Challenges for Kids: A Simple Build and Test Guide

Gather a small paper-building kit

• Several sheets of ordinary paper in the same size and thickness.
• A ruler, pencil and a little tape.
• Two stable books or short stacks of books.
• A lightweight paper cup for a bridge test.
• A piece of rigid cardboard, prepared by an adult, to support the paper ramp.
• A small toy car that an adult has checked for loose parts, for the ramp test.
• Blunt-tip scissors only if you choose to cut paper; adults should supervise cutting.

Work on a clear, low table or the floor. Keep small test objects away from children who put things in their mouths. Do not build on high shelves, climb to measure towers, or use people as test loads. Check the work area for tape scraps and loose pieces when you finish.

Allow roughly five minutes to gather materials and 15–25 minutes for one challenge. Choose just one if time is short. Use a pencil mark to label designs A and B so you do not lose track of which result belongs to which model.

Challenge 1: a folded bridge across a gap

Question: does changing the fold pattern change how this paper supports the same load?

Keep consistent: sheet size, paper type, gap between supports, overlap at each end, test load and placement. Choose a load light enough for safe tabletop testing; a small empty paper cup is a starting point, not a guaranteed test of every design.

1. Set two books about 6 inches apart and measure the gap. Place them so they cannot slide easily.
2. Make design A: fold a sheet lengthwise once, reopen it, then fold the two long edges upward to form shallow side rails.
3. Make design B from an equal sheet: fold alternating strips along its length to make an accordion. Do not add tape to one design unless you allow the same amount for the other.
4. Place A across the gap with equal overlap at both ends. Put the cup gently at the center and observe it for five seconds.
5. Record “held,” “bent but held” or “did not hold.” Remove the cup before moving the bridge.
6. Test B using exactly the same setup. Sketch both designs next to their results.

Try one revision: change the depth of the side rails on a fresh sheet while leaving everything else unchanged. If you change both the fold and the gap, you will not know which change affected the result.

When both bridges hold: the first test did not distinguish them. You can compare how much their centers dip against a ruler, or choose a slightly heavier safe load with an adult. Do not keep adding random objects without agreeing on a consistent test.

For another challenge idea, visit the Classroom STEM Challenge Picker. Review the materials first and keep the same build-test-change approach.

Challenge 2: a freestanding paper tower

Question: which base shape lets your tower stand without being held?

Materials allowance: two sheets of paper and two short pieces of tape per design. Decide the tape length together before starting. Do not tape the tower to the table.

1. Mark a level building area away from fans, open windows and busy walkways.
2. Use the first sheet to make a tube, folded column or another shape. Use the second for a base or extra height.
3. Set the tower down and move your hands away. A successful first test is standing freely for ten seconds.
4. Measure vertically from the table to its highest point while it stands. Record the height and whether it completed the ten seconds.
5. Build a second version with the same materials allowance. Change the base width, keeping the upper structure as similar as practical.
6. Test in the same place for the same length of time.

Example: a 14-inch tower that falls after two seconds does not meet a ten-second standing goal. Record both facts rather than reporting only the height. A shorter tower that stands may be a better answer to your chosen challenge.

When it falls: look before rebuilding. Did the base tip, a fold open, or the middle buckle? Support the part connected to that observation. If you add more tape to fix it, note the changed allowance rather than treating the new result as a like-for-like comparison.

Challenge 3: a paper ramp with a repeatable release

Question: how does the starting height affect how far the same toy car travels after leaving the ramp?

This challenge needs a car that rolls freely and a flat floor with room to stop it safely. Keep people out of its path. Avoid marbles and other small rolling objects around young children.

1. Fold the long edges of a sheet upward slightly to help keep the car on the path. Lay the paper on a rigid cardboard backing and secure it with a little tape so it cannot slip. Rest the top on a low book with the bottom on the floor. Keep this same backing for every test; check that it does not sag under the car and that the car rolls freely before measuring.
2. Mark a release line near the ramp's top and a measurement line where the ramp meets the floor.
3. Hold the car at the release line, then let go without pushing. Measure from the measurement line to where the car stops.
4. Repeat three times. Write all three distances, even if they differ.
5. Raise the same ramp using another book. Keep the same backing and check that the ramp cannot slip. Move the floor measurement line to the ramp’s new exit point so each distance is measured from where the car leaves the ramp, not from the old position.
6. Repeat three releases with the same car, starting line, floor surface and no-push release.

Example record: “Low ramp: three measured distances. Higher ramp: three measured distances.” Fill in your own numbers; a different car or floor may produce different results. If a wheel catches a folded edge, mark that run as a disrupted test and repeat it.

For a younger child, compare the shortest and longest run in each set. An older child can calculate the average, but the measurement notes still matter. A number alone cannot explain a car that veered into a chair.

Make the comparison fair

Before a second test, finish this sentence: “We are changing ___ and keeping ___ the same.” Use new equal sheets when a previous test has torn or badly bent the paper. Damage is another change that can affect a result.

In a class or homeschool group, agree on materials and stopping rules before comparing results. Our low prep elementary STEM guide explains a short group routine, role changes and cleanup.

Paper STEM questions

Can we use newspaper or cardstock?

Yes, if an adult checks that the material is suitable to handle. Use the same type for both designs when testing shape. If you compare paper types, keep the shape and sheet dimensions consistent instead.

Do simple STEM challenges need a winner?

No. Ask each child to show one test and one change. Different designs may answer different goals, such as maximum height or standing reliably.

What if the paper will not cooperate?

Try a shorter span, lower tower or gentler ramp. Explain that you changed the goal for the next round. You can also work together on a fold rather than taking over the whole build.

Choose your next build

Keep a sketch of the design you want to revisit. The STEM challenge picker can provide another starting idea. If your family or group found it useful, share that link with a teacher or another parent—no finished model or special supplies required.

More ways to use what you have

For a choice beyond building, visit our screen-free activity guide. If you want reusable materials after trying these household projects, browse building and construction toys; check the selected product’s age guidance and parts before choosing.