The Poker Card Fast Calculate Trick

Playing cards with four sets of numbers printed on them each.

No matter which side you pick, within seconds you could calculate the total sum of any four lines of numbers.

This is a magical mathematical trick toy, you can use it to cultivate children’s passion for learning mathematics. 
  
You can even give a calculator to the audience, and challenge them to a match. See who will get the calculation done faster, and more accurately!

All props can be checked!