# Kareem has 216 role-playing game cards. His goal is to collect all 15 sets of cards. There are 72 cards in a set. How many more cards does Kareem need to reach his goal?

Kareem has 216 role-playing game cards. His goal is to collect all 15 sets of cards. There are 72 cards in a set. How many more cards does Kareem need to reach his goal?
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Since there are 72 cards in a set, then Kareem needs to collect a total of $15×72=1080$ cards. Since Kareem currently has 216 role-playing game cards, subtract 1080 by 216 to find how many more he needs:
$1080-216=864$