Standard Measurement Conversion Review using QR Codes for a classroom walk around or a table center. Creating QR activities gives student the opportunity to get up, move, and to discussing the answers. There are many ways you can use QR activities, as a class beginning or ending activity, as a formative assessment or just to assess prerequisite skills. There are two versions of the same set of standard conversions using both volume and distance measurements. Students can be given a QR