I had the students use different color crayons to color the multiples on a hundreds chart. They made a key to show each color and what specific multiple it was. They did each of the multiples from 2-12. I had them do one different page for each number and I then put all those sheets together, 3 hole punched them, and let the children put them inside of their math notebook. I let them use it as a reference during math time...except for tests that is. This also incorporates some of the data analysis standards as they are creating a chart with a key.