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Let the participants hold onto the cards, flip them as many times as they like, and arrange them in any order. Then, by asking just one question, determine the total of the numbers they’ve chosen.

Imagine you had 1,000 feet — and therefore 1,000 shoes. That’s the case for a very special family: the centipede family. How long will it take to unlace all the shoes?

In preparation for a concert, five girls decide to line up to buy tickets. But in what order are they standing?

Frederique and Sophie are friends. Can you discover who’s lying and determine what colour Sophie’s sweater is?

Augustine went through a lot of logs this winter. Was the winter long? Only you can find out!

Pascal was lucky enough to go fishing with his father during the family vacation. Take on the challenge and figure out how long he was on vacation — it all depends on how many fish he caught!

Helen is camping. She has a 3L pot and a 5L pot, but she needs exactly 4L of water.

Mathias is an experienced waiter. He knows he must light one candle per hour to create a warm atmosphere. What is the number of hours during which exactly three candles will be burning at the same time?

Help Benjamin and his mother get all the shopping done before leaving for vacation. Careful! They don’t want to visit the same place twice!

Our friends need to cross a bridge as quickly as possible — but there are rules to follow. Watch out! Only two people can be on the bridge at the same time, no more.

Ah! The Eiffel Tower! What a magnificent structure. Pauline wants to go there by bike, but the journey isn’t so simple because she has a very specific idea in mind.

Help the aliens figure out how many of them are right-handed. Don’t worry — they won’t take you to their planet.