Three-Addend Column Addition Worksheets – 2-, 3-, and 4-Digit Numbers (3,600 Exercises) These worksheets help students practice adding 2-, 3-, and 4-digit numbers in columns. Designed for Grades 2–4, the problems include both with and without regrouping, giving students structured practice to build math fluency, confidence, and multi-digit addition skills. With 200 printable pages and 18 exercises per page, students complete a total of 3,600 addition problems, providing plenty of opportunities f