In this engaging Grade 2 and 3 CSI Math Mystery, students solve addition and subtraction problems, place value tasks, and rounding to the nearest 10 to uncover which alien abducted their school principal. This CSI math activity turns essential 2nd-grade and 3rd-grade math into an exciting investigation where students solve math clues, eliminate suspects, and crack the case step by step. Students work through a series of math challenges, using their answers to cross suspects off the list until on