This math assessment workbook provides students with practice in adding small numbers mentally, selecting appropriate math vocabulary (sum, difference, estimate), and applying place-value understanding to round two- and three-digit numbers to the nearest ten or hundred. Each problem asks children to perform single-step or short multi-step calculations (e.g., "round 572 to the nearest ten, then add 20") and to pick reasonable estimates. This workbook is bursting with a mix of vertical problems, tantalizing missing digits, and easy-to-follow addition equations.