Dale and I just began working on multi-digit operations. We planned two lessons on addition (revisiting the concept multiple times throughout the unit, with an emphasis on mental addition and later, adding money). But we though an initial two lessons to construct, discuss, record and practise multi-digit addition strategies would be sufficient before moving on to subtraction. Alas, after the second lesson, we both noted that many of our students are just beginning to grasp the concepts (making tens and compensating, rounding and estimating, add tens, then ones, then combine, etc.) we were hoping they would solidify in these lessons.
So, we have decided to put together one more consolidation lesson. We hope that "Lesson 3AB..." will serve to summarize the dialogue from the previous two lessons, and solidify more students' understanding of various multi-digit addition strategies.
It is not a 3-part or Bansho lesson in the same way we have been teaching other lessons, but we think that's okay!
Hopefully this extra day spent on addition will help students become more confident with addition, so that when they return to it later in the unit, there will be a more solid foundation to build on.