This dominos activity is used to cover adding decimals. Give each student or group/pair of students a set of the dominos. I usually print them on cards stock and put them in Ziploc bags. Use the original copy to check the student work.
Read to students:
Find the domino that says start. Add the decimals and look for the answer on the other dominos. Continue matching the dominos in a line with the questions on the right side of a domino matching with the answer on the left side of the next domino. Keep matching until you reach End.