This is a collection of our multi-digit addition worksheets with answer keys. It covers adding 2-digit, 3-digit, and 4-digit numbers with and without regrouping. You can use these math sheets as a review, homework, quiz, pre-test, assessment, drill, or practice for your students in the 2nd, 3rd, or 4th grades. *** View our ADDITION Bundle to save and get all types of worksheetsEach problem type has all the sets below, each with ten worksheets. Just pick and print the sheets that suit your needs