Give each student 20 blocks and a sheet of paper with a rectangular box that can hold only 10 blocks. Show them an addition problem, and have them make groups of blocks for digits in the ones column. Have them combine the groups together in the box. Because the box can only fit 10 blocks, some will be left out. Have students count the total number of blocks, explaining that the number of blocks outside the box will be the first number in the answer, while the one set of ten blocks will be carried over to the next column. Repeat the process with several problems until students are comfortable with the concept of carrying.
Give every student in class a number written on a small piece of paper. Tell students that every number has a corresponding number that will add up to one hundred, and that they need to find the other student who has that number. Tell students to write out and solve the addition problem with the carrying method on their papers when they find their partners.
Split the class into groups. Give each group a set of 80 cards with eight sets of each digit from zero to nine on them. Students will split into teams of two and one student will deal four cards in a square, forming an addition problem. Afterwards, the dealer will give each player four cards and set the rest aside. Players will take turns placing cards in the proper places to solve the problem, including carrying the one. If a player has no card to place, she will discard and take another. The team that places the most digits correctly takes all the cards in the problem, and the team with the most cards wins.
Take the class outside. Beforehand, draw a two-digit addition problem that needs carrying to solve on the blacktop with chalk. Beneath the first column, there should be the same number of squares as the digits in the ones column added together: for example, if you did the problem 34 + 27, there would be eleven squares. Ask a student to hop on his right foot down across the squares, but switch feet after reaching nine. Afterwards, ask the student how many squares he hopped on his left foot, which will be the number in ones column. Use the chalk to carry the one over, and draw the number of squares needed for the tens column. Repeat the process until the problem is solved. Thereafter, pair students off and give them chalk to make their own hopscotch addition problem.