Find Your Number Relay

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To answer a math question quickly and find the correct cone with that ending number 17 = a 7

Teams of three players line up behind a starting line.
Numbered cones are spread out in a random order (with numbers facing away from the players) about 10+ paces from the starting line.

The leader holds up and calls out the numbers of two playing cards (Jack is 11, Queen is 12, King is 13, and Ace is 1)
The players add up the cards (for example a 7 and a Jack (11) equals 18) and the first player in each line runs to find and tag the cone with the correct number (8 in the example).
The first player to do so wins a point for their team.
As soon as a number is found the leader holds up the next two cards.
Continue for a set time or till a team has a certain number of points.

Could make the challenge more difficult by using spots or topple tubes with numbers underneath.
Teammates should remember where certain numbers are, because the longer the game is played the more often the same number will appear.