Are you looking for a fun and hands-on activity to help your 3rd graders identify and name the types of addition, subtraction, and multiplication word problems including comparison problems, change problems, equal groups problems, and multiplication comparison problems. This engaging self-checking center activity decodes secret mystery messages. This activity set includes: 16 Word Problem Cards3 Instructional Task Cards4 Sorting Mats1 Page Student Response SheetPrintable Cover Sheet for Folder