The second player turns up a card, adds it to the first card, and says the sum of the two cards aloud. (educationworld.com)
The ministers said this sum is the minimum that will be needed over the next three years to evaluate, repair or shut down reactors. (newscientist.com)
The next person turns over a card, adds it to the card already played, says the sum out loud, and places the card on top of the previously played card. (educationworld.com)