Double Digit Addition just got a lot more interesting! Grab this CLASS FAVORITE for your math center activities! These 12 sets of problems challenge students to combine logical problem-solving skills with their knowledge of double-digit addition (with regrouping). Numbers 0-9 are located at the bottom of each page. Using these 10 tiles, students will fill in the missing digits to make 4 correct addition sentences per page, but using each tile ONLY ONCE! These Logic Puzzles Are Perfect For: