SimplyClever.Cards Subtraction 1 combines traditional playing cards with math flash cards. The deck has 52 cards in 4 colours numbered 0-12, and 4 jokers. Each card is illustrated with a subtraction calculation (e.g. 1-1, 3-2 or 15-3) corresponding to the card value from 0 to 12. One joker has a table showing which 4 cards match up for each value, in order to check the math when necessary. The remaining 3 jokers have mathematical operators +, - and = so you can make your own calculations using the cards. Designed to function like a regular deck of cards (including traditional pips for suits and ranks), SimplyClever.Cards Subtraction 1 allows you to play any regular card game you want to - but with a mathematical twist! Game examples: 500, Casino, Crazy Eights, Go Fish, Hearts, Memory, Old Maid, Slap Jack, Snap, UNO etc.