Then proceed to say that you’re going to explain the maths behind this trick as you go. This works really well if you’ve done a few other tricks already that you have refused to explain. Holding the pack face-down, begin taking a card at time and placing them left to right in three face-up piles, starting at the left each time. As you start doing this, explain that it is a common magic trick to put the cards into multiple piles and then get the volunteer to just say which pile their card went into, but not what the card.
