January: two weeks off, four months of math to recover.

They come back from break having forgotten regrouping, the schedule, and possibly your name. The Mid Year Math Check In, one packet per grade from Kindergarten to 5th, starts with one page per skill to show what came back, then gives practice for only the skills it flags. For 3rd and 4th grade, four weeks of January spiral review bring the fall semester back without reteaching it from scratch.