Includes 80 assignments and timed tests, 2,400+ problems (answer keys included) This workbook includes 80 assignments and timed tests designed to strengthen your student's basic addition and subtraction math skills. Featuring over 2,400 unique problems, this workbook is perfect for a classroom or homeschool setting. With each assignment getting progressively more difficult, your student will be tested on basic addition and subtraction, followed by more complex double and triple-digit problems with and without regrouping, and finally "find the missing number" and timed tests. This Workbook • 69 assignments with 20 questions each • 18 timed tests with 60 questions each • Answer keys to each assignment • Table of Contents serves as 90-day syllabus