Use dominoes to practice two-digit addition. Provide children with a pile of dominoes; instruct them to take two dominoes and convert the dots on the tiles into two-digit addition problems. For example, if a child takes a domino that has two dots on one side and three dots on the other and a domino that has one dot on one side and four dots on the other, she could create the problem 23 + 14. She can use the dots on the dominoes as a manipulative to help her solve the problem.
Engage pupils in a two-digit addition competition. Divide the class into two teams and have each team form a single-file line. Write a two-digit addition problem on the board. Tell the first two players on each team to try to solve the problem; they may use paper and pencil, if necessary. The first player to solve the problem earns a point for his team. The first two players then step to the back of the line and the next two players try to solve a new addition problem. The team that earns the most points wins the game.
Play a game of Around the World to reinforce double-digit addition. On index cards, write double-digit addition problems. Have your pupils sit in a circle and randomly select one pupil to stand up behind the person sitting on her left. Hold up an index card; whoever solves the problem first, the person standing up or the person sitting down, moves around the circle and stands behind the next person in the circle. If the person who is sitting down answers the problem, he stands up and the person who was previously standing sits in his place. The game continues in this manner until one student makes it completely around the circle.
Pairs of pupils can work together to try to solve double-digit addition problems as quickly as they can. Divide the class into pairs and provide each pair with a piece of paper and a pencil. State a double-digit addition problem; the pairs of pupils then work together to solve the problem. The first pair to solve the problem earns a point. The pair that earns the most points wins the game.