Winter 3-Digit Addition With Regrouping Worksheets 50 Worksheets + Answer Key | 2nd–4th Grade | PDF Strengthen your students’ multi-digit addition skills this winter with this engaging and beautifully designed Winter 3-Digit Addition With Regrouping worksheet set! Perfect for 2nd Grade, 3rd Grade, and 4th Grade, this packet helps students build confidence and fluency in vertical addition while enjoying calm, cozy winter-themed illustrations such as snowmen, penguins, mittens, snowy mountains, wi