You can easily create numeral cards using index cards and markers, or you can use playing cards and remove the face cards. Students can play Math War, where each player is dealt half the deck face down, then they lift the top card of each pile at the same time and whoever has the higher (or lower) card wins that round. Students can also practice addition or multiplication by lifting the top two cards and adding or multiplying them to see who has the highest amount. Numeral cards can also be used to play Make 10 (or 20, or the number of your choice). Each player is dealt 10 cards and then they use as many of them as possible to make the number. Younger students can just focus on adding, but older students can use all operations. The first player to get rid of all of her cards is the winner.
Dominoes are another option for math games. Students can play in pairs, with each student starting by choosing seven face-down tiles. Then players can lay out tiles one at a time by trying to match amounts, such as laying a four-dot side next to another four-dot side. After students have mastered that, they can try to match sides that add up to 8, 10 or 12. Next students can try to subtract sides so that they equal 1 or 2. If a student can't play with the tiles he has left, he needs to choose from the leftover tiles until he finds a match. The student who gets rid of his tiles first is the winner.
Students in kindergarten through third grade should be familiar enough with the game CandyLand that they can create and play their own version. Small groups can make game boards in the style of the preschool favorite, but cards can have math equations on them instead of colors. Students will then have to figure out the answer to the question to know how many spaces to move. You can have different sets of cards to practice different skills such as addition (4+5 means the player moves 9 spaces, for example), subtraction (14-8 means the player moves 6 spaces) or division (42/6 means the player moves 7 spaces).