Use this work mat during your lessons on addition with regrouping!
Suggestion: Laminate these sheets to allow for repeated use with white board markers. My students wrote the problems out using the markers and wrote the answers on strips of paper which they placed in the answer boxes. If the answer in the ones column needed to be regrouped, they simply tore off the tens and physically moved it up to the regrouping box! They loved it and so did I!