Students have trouble distinguishing between factors and multiples. Use these 27 sorting cards with descriptions or examples of factors and multiples. Students can sort them into the two groups at a table, or you can give one card to each student in the whole class and have all the factors go to to one side of the room and the multiples go to the other. There is one card that is common to both. Answers are given in the header. Print out on card-stock to use over and over. Then they can time themselves to see how fast they can sort.
Revised file uploaded 2/22/16. Two cards containing errors were fixed!