This is a set of 20 multidigit addition hidden number puzzles. These puzzles use the standard addition algorithm. **NEW! These are now available digitally on Easel! Teachers can assign all or some of the problems (hello, differentiation!) to students via a link. Students can complete them on their devices and then submit them for teachers to review and provide feedback. Included in this product: -list of ways to use these puzzles -instructions for how to use them as a whole class activity -d