Make addition exciting with these 3-digit addition with regrouping Math Mystery worksheets! Perfect for 2nd, 3rd, and 4th grade students, these detective-style math activities combine critical thinking, problem solving, and addition practice in a fun, story-driven format. Each worksheet starts with a short mystery to hook students. They solve 3-digit addition with regrouping problems to reveal clues and eliminate suspects. These no-prep math worksheets are ideal for daily warm-ups, math centers