3rd Grade Addition Worksheets

Practice standard addition problems ranging from simple sums within 5 all the way up to four-digit plus four-digit addition. Worksheets are available in both vertical and horizontal formats and cover key skills like regrouping (carrying), adding multiples of ten, finding missing addends, and solving mixed addition and subtraction problems. These resources align with Common Core standards from kindergarten through fourth grade, giving students structured practice at every level.

When students are ready to add more than two numbers at once, these worksheets provide the practice they need. Activities range from adding three single-digit numbers with sums under 20 to adding three and four two-digit numbers with regrouping. Word problem versions are also included, where students pull key numbers from a story and add multiple three-digit addends. These worksheets align with first through third grade Common Core standards.