Division by Decomposition: Step-by-Step Walkthrough

Section role: supports the formalization of the decomposition method while the teacher guides the class through whiteboard modeling and shared examples. Slides: (1) Title — 'Division by Decomposition: Breaking Big Numbers'; (2) What is a Dividend? — bullets: definition of the dividend as the big number, visual of a number bond showing 69 broken into 60 and 9; (3) The 3 Steps — bullets: Step 1 Break, Step 2 Divide, Step 3 Add, connecting back to the Toy Factory challenge from the previous section; (4) Example 1: 96 ÷ 3 — bullets: color-coded tens (90 ÷ 3 = 30) and ones (6 ÷ 3 = 2), adding 30 + 2 = 32; (5) Example 2: 44 ÷ 4 — bullets: color-coded tens (40 ÷ 4 = 10) and ones (4 ÷ 4 = 1), adding 10 + 1 = 11; (6) Summary and Common Mistakes — bullets: reminder not to forget adding the results back together, connection to the upcoming individual mission worksheet. Closing slide: 'Are you ready to solve your own division mysteries?' — sets up the individual practice section that follows.

Lara de Teachy