These are task cards for practicing linear measurement using both the U.S. standard system and the metric system. There are also cards that address perimeter and finding benchmark measurements in the classroom. These are get out of your seat and move around with your partner sets of activities great for center work! Students can show all of their work in their math notebooks. They should also show proof of how they know. They can meet with other groups at the end of a session, or center cycle to share their findings and compare what they discovered on their measurement scavenger hunts!