Can you step through an index card?

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

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