What this worksheet practices
Regrouping is place value in action. When the ones column reaches ten or more, students exchange ten ones for one ten and keep adding. The point is not a trick called carrying; it is a way to preserve the value of the number while writing it in a more useful place.
The bakery model makes carrying visible: ten loose cookies fill a box, and that box moves to the tens place. Students see the carried 1 as one new ten, not an extra digit to memorize.
Accuracy matters more than speed here. If a child keeps adding the carried ten twice or forgetting it entirely, step back to base-ten blocks or draw tens and ones for a few problems. Then return to the printable once the written method has meaning again.
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