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Home » Science Experiments for Kids » Can you step through an index card?

Can you step through an index card?

Modified: Apr 8, 2019 · Published: Aug 26, 2017 by Emma Vanstone · This post may contain affiliate links · 1 Comment

My children were very impressed when I showed them this little trick and can’t wait to try it out on their friends when they go back at school. When you look at an index card it seems pretty obvious that you can’t cut a simple circle in the middle and step through it, but with some clever cutting you can keep the paper connected but make it stretch out enough to step through. The surface area of the card stays the same, it just gets redistributed.

Materials

Index cards or paper cut to the size of an index card

Scissors

Instructions

Fold the card or paper in half.

How to fit through an index card

Cut down the folded edge as shown.

How to fit through an index card

Cut up the opposite end between the cuts you already have.

How to fit through an index card

Very carefully cut through the centre folded edges, do not cut  the outer edge at each end.

How to fit through an index card

Open up and step through your now very long index card.

How to fit through an index card

Extension Tasks

How could you make your ring of paper longer?

What’s the smallest piece of paper you can cut and still step through?

What happens if you make the cuts closer together?

How to fit through an index card

 

Step through an index card

Last Updated on April 8, 2019 by Emma Vanstone

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Safety Notice

Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

Reader Interactions

Comments

  1. Lisa

    May 17, 2018 at 9:41 am

    What size index card did you use?

    Reply

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