ALT Quote on verbatim explicit instruction from Archer, Hughes in "Explicit Instruction"
"Watch me while I show you the steps for solving two-digit addition problems that require regrouping. I want you to help me out with some of the things you already know. [Teacher writes 46 27 vertically on the board.] Read the problem. 46 27. Which column do we add first? [Teacher requests a group response.]. The ones. That's right, the ones column. Add the ones in your head. [Pause.] Tell me the sum everyone. 13. Correct, it's 13.
When the sum of a column is greater than 9, you need to regroup..."