Continue learning with Elementary Math Steps 3 & 4 Workbook, and dive deeper into double-digit addition, both with and without regrouping. Mark milestones in the workbook with the sheet of star stickers included with the pack. There are also two math storybooks to enjoy! Take off with Chow’s Zippy Day, a story that represents two- and three-digit numbers in action using place value blocks. Then get ready for A Visit with Madam Addison, a hilarious rhyming book that includes examples of two-digit regrouping.