Decade or Ten-Twenty-Thirty is a Patience game of the Simple Addition family played with a traditional 52-card deck.

It is akin to another solitaire game called Accordion, but during game-play three adjacent cards totalling 10, 20, or 30 can be removed (face-cards count as 10).

[2] Decade is a relatively modern game of American origin, first appearing in 1949,[1] but seldom since, perhaps a consequence of its low probability of success.

Using a standard 52-card deck of playing cards (without jokers), three cards are drawn from the bottom of the deck and placed face-up in a line on the table laid out in the order they were drawn so the faces can be read.

The game continues until all cards are dealt or discarded, or when no more sets can be collected.