This is an ideal math center or workstation for first grade to practice the Common Core Standard 1.NBT.5. This activity includes 60 game cards. This game is played by first deciding to either play ten more or ten less. Then the students divide the cards into two equal piles. The students flip over the top cards at the same time. The first student to say either ten more or ten less (depending on which way you are playing it) than the number on his/her card, wins both cards. The goal is to win all of the cards!