7 Easy STEM Activities for Kindergarten Kids Ages 5-6

These are the kind of kindergarten experiments that look a little magical the first time, which is usually enough to get a five- or six-year-old leaning over the table asking what just happened.

A comb pulls paper without touching it, an egg sits higher in salty water, a card holds water inside an upside-down cup, and a drop of water makes a picture look bigger. The setup stays short, but the result gives kids something worth staring at for a minute.

Keep the first round simple and let them make a guess before you show the result. If they want to repeat it with one small change, that's where the activity usually gets more interesting.

1. Static Comb Paper Lift

Rub one clean plastic comb several times through dry hair or across a wool cloth, then hold it near a few lightweight paper strips on the table without touching them. Watch for movement. Keep the strips large enough to clean up easily.

The paper strips should be light enough to move but large enough that cleanup is easy. Charge the comb, bring it close, then back away and repeat so your child can see the attraction disappear with distance. If one rubbing material works much better than another, they will usually notice before you say anything.

Why it works:

Why it works: Rubbing transfers electric charge, and the charged comb can attract lightweight neutral paper through electrostatic forces.

Age range tweak:

• Age 5: Use a few broad paper strips and let an adult demonstrate the first charge.
• Age 6: Compare two rubbing materials and see which gives the strongest paper movement.

2. Egg Float Salt Test

Fill two clear cups with the same amount of water. Stir several spoonfuls of salt into one cup until dissolved and leave the other plain. An adult lowers one clean raw egg gently into each cup. Keep the setup in a tray and wash hands afterward.

Use clear cups so the egg positions are easy to compare from the side, and lower the eggs gently so cracked shells don't become the main event. After the first comparison, let your child predict what happens if more salt is added to a third cup. Keep the amounts reasonable and let the rising egg do the convincing.

Why it works:

Why it works: Dissolved salt increases the water's density, which increases the buoyant force on the egg.

Age range tweak:

• Age 5: Let an adult handle the eggs and let the child compare plain and salty water.
• Age 6: Add salt gradually to a third cup and watch when the egg begins to rise.

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3. Bottle Thermometer Expansion Demo

Fill a clear bottle almost completely with room-temperature colored water so only a small air space remains. Insert one full-size clear straw through a snug playdough seal at the opening so the straw dips into the water and the starting level is visible inside the straw. Place the bottle in a bowl of comfortably warm water and watch the level. Adults should handle setup and temperature.

Mark the starting water level on the straw with a small piece of tape before the bottle goes into warm water. The movement may be gradual, so give it a little time and keep the bottle still. If your child wants to reverse the effect, move the bottle to a cooler water bath and watch the level again.

Why it works:

Why it works: Warming expands the water and any small amount of trapped air in the sealed bottle. That small volume change pushes the colored water along the narrow straw, where the movement is easier to see.

Age range tweak:

• Age 5: Let an adult build the sealed bottle and let the child watch the level change.
• Age 6: Mark the starting level with tape and compare warm and cool water baths.

4. Index-Card Water Seal

Fill one smooth-rim plastic cup partly with water. Place one sturdy index card over the opening, press it flat, and have an adult invert the cup over a sink while holding the card. Carefully remove the supporting hand from the card and watch it stay in place briefly.

Do this over a sink the first time because even a good setup can turn into a sudden cup of water on the floor. Let your child press the card flat before the adult inverts it, then count a few seconds after the supporting hand comes away. A failed seal is useful too because they can inspect the rim and try again.

Why it works:

Why it works: Air pressure pushing upward on the card can exceed the downward force from the water when the seal is good.

Age range tweak:

• Age 5: Let an adult do the inversion while the child watches closely.
• Age 6: Compare a dry card with a slightly damp rim and discuss which seals better.

5. Salt-and-Sugar Dissolving Compare

Put the same amount of room-temperature water into two clear cups. Add one level spoonful of table salt to one and one level spoonful of granulated sugar to the other. Stir each cup the same number of times with separate spoons, then compare what remains visible. Treat the result as an observation, not a contest with a guaranteed winner.

This works better when you resist declaring a winner before the test. Let your child look closely at both cups after the same number of stirs and describe what is still visible. If the result is messy or close, that's a good reason to run another round with one condition changed more carefully.

Why it works:

Why it works: Dissolving depends on the substance, grain size, amount, water temperature, and stirring. Keeping several of those conditions similar lets the child compare what happens in this particular test without assuming salt or sugar must always dissolve first.

Age range tweak:

• Age 5: Use one level spoonful in each cup and compare after a fixed number of stirs.
• Age 6: Repeat with one carefully chosen change, such as more stirring, while keeping the other conditions similar.

6. Water Lens Magnifier

Put one large clear drop of water onto a sheet of transparent plastic laid over a simple drawing. Look straight down through the rounded drop. Add a little more water and compare how the image changes.

Use a simple bold drawing underneath so the magnification is obvious enough to be satisfying. Let your child slide the picture slowly beneath the water drop instead of poking the drop itself every time. A larger drop may distort more as well as magnify, which gives them another thing to notice.

Why it works:

Why it works: The curved water surface bends light like a simple convex lens, magnifying parts of the image underneath.

Age range tweak:

• Age 5: Let an adult place one large drop and let the child move the picture underneath.
• Age 6: Compare small and larger water drops and notice which gives stronger magnification.

7. Rubber-Band Pitch Box

Stretch several sturdy rubber bands of different widths around a small empty tissue box with adult help, keeping faces away during setup. Pluck one band at a time over the box opening and compare the sounds. Move one band slightly tighter or looser only if an adult can do so safely.

Keep the bands sturdy and inspect them before use so nobody gets snapped by an old cracked one. Pluck each near the middle over the box opening and give the sound time to finish before trying the next. Kids often start arranging the bands from low to high pitch on their own, which is a great way to extend it.

Why it works:

Why it works: Band thickness, tension, and vibrating length affect how quickly the band vibrates, which changes pitch.

Age range tweak:

• Age 5: Compare two sturdy bands with clearly different widths.
• Age 6: Compare several bands and predict which will make the highest sound before plucking.

The Bottom Line

These are easy enough to set up quickly, but each one has a result that can make a kid stop and look twice. That little surprise is often all you need to get the questions going.

If they immediately want to run the test again with more salt, a different rubber band, another water drop, or a new rubbing material, let them. The second question is usually more interesting than the first explanation.

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