Place Value: mapping digits and values

Section role: supports the formalization of discoveries in Section 3 while the teacher guides students through the giant Place Value Chart on the board and introduces expanded form. Slides: (1) Title — 'Mapping the Value of Every Digit'; (2) Giant Place Value Chart — bullets: columns from ones up to thousands using numbers created in Section 2; (3) The 10x Rule — bullets: why moving one column to the left multiplies value by ten; (4) Expanded Form Demonstration — bullets: pulling apart 4,321 into 4,000 + 300 + 20 + 1; (5) The Placeholder Zero Trap — bullets: comparing 502 and 52 to explain what happens when a place is empty; (6) Video Intermission — bullets: cueing the Math Antics video to visualize jumps; (7) Check for Understanding — bullets: asking the class to state the value of the 3 in 3,421. Closing slide: 'How does a digit's home change its power?' — hands control back to the teacher to set up individual practice in Section 4.

Lara from Teachy