This math workbook for assessment helps check mental math fluency and number sense. It includes a variety of problems focused on addition and subtraction, rounding numbers to the nearest ten or hundred, and making estimates for differences between large numbers. Students will practice adding and subtracting two-digit and three-digit numbers, and identifying the correct terminology for the results, such as "sum" and "difference." Rounding exercises require students to determine the closest ten or hundred to given numbers. Additionally, problems ask students to find sums after rounding and adding a specified amount, as well as making mental estimates for differences.

This unit aligns with Common Core skills for developing fluency in addition and subtraction within 1,000, understanding place value, and using estimation strategies.