Want to try an escape room without all the stress? Use this 2 digit and 3 digit addition with regrouping math mystery or challenge, perfect for math enrichment! In this math activity, students will practice addition while engaged in solving a mystery! This digital (Google Slides & Seesaw) & printable addition with regrouping challenge is a hit! This is the perfect set of addition activities and practice for 1st grade & 2nd grade students working on addition to 20, two-digit addition, and t