One way students can solve 2 digit addition (with and without regrouping) is by using base ten block manipulatives. This is a concrete method for teaching students how to add larger numbers so they develop a conceptual understanding. After you use the manipulatives, you can use these worksheets to reinforce their understanding. Students draw base ten blocks and show how they make groups of 10 (regrouping). There are also worksheets where the base ten blocks are drawn and students count, write the number, and add. There are also 2 pages of word problems for students to solve with their quick drawings of base ten blocks.