Magic Chocolate Bar

Is it possible to eat a piece of chocolate from a chocolate bar and still have the same amount you did before you ate the piece? Download the printable here and find out!

  1. Ages: 5 - 16

  2. <30 minutes

  3. A little messy

  4. Grownup needed

Materials you'll need

Step-by-step tutorial

  • Step 1

    Gather your materials.

    Photo reference of how to complete step 1

  • Step 2

    Cut the printable along the dotted lines.

    Photo reference of how to complete step 2

  • Step 3

    Rearrange the pieces of the chocolate bar leaving the smallest piece out. Now you have a piece of chocolate you can eat, and the whole bar leftover!

    Photo reference of how to complete step 3

  • Tip

    If you’re having a hard time figuring out the trick to this puzzle, flip the printable over to see the answer, or keep reading!

  • Photo reference of how to complete step 5

    Learn moreMagnifying graphic

    Well, you don’t really have a whole bar left over. If you tape around the original chocolate bar and then rearrange the pieces again so that the smallest piece of chocolate is left out, you’ll see that the two “whole bars” aren’t the same size at all! The final bar is a tiny bit smaller than the original one.

  • Learn moreMagnifying graphic

    The trick to this chocolate bar isn’t magic at all — it’s geometry! The piece of chocolate you removed takes up the same amount of space as the gap in the final chocolate bar, it’s just arranged differently. Instead of being a long and skinny rectangle, it’s a short and wide rectangle. The short and wide rectangle is a lot easier to notice than the long and skinny gap where it used to go, which is why the final bar looks so similar to the original bar. If you really want to, you can cut up the short and wide piece to see that it fits exactly in the final bar’s sliver of missing chocolate.

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