Engage the whole class in a math relay race. On two sets of index cards, write math problems that you wish to review and place both piles on your desk. Divide the class into teams and instruct them to form single-file lines. On your mark, the first player on each team runs to the desk, takes a card from the piles and tries to solve the problem. If the problem is answered correctly, players run back to their teams and tag the next person in line. The game continues until all of the players on one team have answered a question; this team wins the game.
Teams of students race to answer a given set of math problems as quickly as they can in this game. Divide the class into three to five teams and provide each team with a math worksheet. When you give the signal, the teams work together to solve the problems and write their answers on the worksheet. Upon finishing the worksheets, a team member brings it to you. Check over the answers. The first team to correctly answer all of the problems on their worksheet wins.
On the board, write two columns of math problems. Divide the class into two teams. When you say go, the first two players from each team try to solve the first problems in the columns. They must write their answer on the board. If a player answers a problem incorrectly or doesn't know the answer, she moves to the back of the line and the next player tries to solve the problem. The first team to answer all of the problems in a column wins the game.
Blow up a beach ball and use a marker to write numbers all over it. Have your class stand in a circle and before tossing the beach ball, state an operation that you want students to use. Toss the ball into the circle. The student who catches it uses the numbers underneath his hands to create a math problem using the operation you have stated. For example, if you said "multiplication" and the person who caught the ball had the numbers five and six under his hands, he would solve the problem 5x6. If the student answers the problem correctly, he tosses the ball to another student; if he does not, another person can volunteer to answer the problem.