4-Digit Subtraction Color by Number rewards every correct answer with another piece of a hidden picture. Students solve each problem, match the answer to the color key, and a hidden picture appears region by region. Students apply the standard algorithm to four-digit differences. Built for Grade 4 and aligned to 4.NBT.B.4. It's no-prep and self-checking, perfect for centers, fast finishers, review days, or sub plans, with both a print-ready PDF and an interactive answer-key version in every download.