Lesson materials located below the video overview.
Addition, subtraction, multiplication. Now it is time for division.
Here’s an example of a division problem: Compute \(276 \div 12\).
And here’s a horrible way to solve it: Draw a picture of \(276\) dots on a page and then circle groups of twelve dots. You will see, after about an hour, that there are \(23\) groups of twelve in a picture of \(276\).
Here’s a great way to solve it: Draw a picture of \(276\) dots in a \(1 \leftarrow 10\) machine and just see right away that there are \(23\) groups of twelve in it!
Read and play on to see how we can do this.
Cool Fact: Did you that the division symbol \(\div\) is called an obelus?
Supplementary Content for this Experience:
PDF files of this first chapter
Chapter 5 EXPLODING DOTS (English)
Chapter 5 EXPLODING DOTS Bulgarian (Translated by Stanislav Chobanov)
Chapter 5 EXPLODING DOTS Chinese (Translated by Xinli Wang)
Chapter 5 EXPLODING DOTS Spanish (Translated by Cindy Weitzman)
A PDF guide for teaching this experience
Scolab‘s fully interactive web experience
Additional apps by Geogebra, Wolfram, Chee Wei Tan, Ken Wessen, Ulrich Kortenkamp, and more!
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