Rounding to the Nearest 100 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 round numbers to the nearest 100 and sharpen estimation. Built for Grade 3 and aligned to 3.NBT.A.1. 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.