These centers and worksheets follow the Math Expressions pacing and Common Core State Standards for Third Grade. They align with Math Expressions Unit 3. The first center teaches students how to measure using non standard units (a paperclip and a marker) and encourages them to think about when it is easier to measure with each object (for example, it is easier to measure smaller items with a paper clip and larger items with the marker). The second center teaches students how to measure to the nearest 1/4 inch. I had the students use the rulers that were provided in the math expressions book that only had quarter inch marks and labeled the fractions for scaffolding. The last center gives the students' measurement data of caterpillar lengths and they must plot that data on a line plot. For this center I made a graph on the floor of the classroom using blue painters tape and post it notes. First, they worked together to make the graph on the floor, then they copied their graph in the workbook. Included I also have the posters that I placed at each center that explained what the children needed to do. The last page is an "I'm Done Page" where the students simply went around the room and measured different objects and recorded their measurements. I also created another worksheet that the children could use to measure bugs to the nearest quarter inch. I used this to give the students extra practice because a few misconceptions came up in the original center activities that needed to be addressed.