Remove Jokers, Kings, Queens, Jacks, Tens
Ask participant to shuffle the remaining cards.
Fan the cards, instruct participant to pick a card, memorize it then put it back into the deck.
Turn your back to the participant.
Ask them to complete the following steps:
Their card x 2
Add 5
Multiply by 5
Participant must remember this number.

Ask participant to choose another card from the deck.
Add this card to the preceding total.
Ask them to now reveal this total.
You must mentally subtract 25 from their answer.
The two digits are the two cards they had selected.