Detective Math Case #1: The Vanishing Digits is a premium mystery-style math workbook designed for Grades 3–4 students who love puzzles, clues, and detective adventures. Students become junior detectives inside Digit City, solving math crimes using place value, rounding, comparing numbers, expanded form, and multi-digit reasoning skills. Instead of traditional worksheets, this workbook transforms math practice into an immersive detective case file filled with: • crime scenes • suspect rankings •