## Exploding Dots

### 4.1 Welcome

Lesson materials located below the video overview.

Okay. Let’s keep working with the $$1 \leftarrow$$ machine.

So far we’ve made sense of addition and multiplication. But we skipped over subtraction. Why? Because I don’t believe in subtraction! To me, subtraction is just the addition of the opposite.

Let’s explore what I mean by this.

Supplementary Content for this Experience:

PDF files of this first chapter

Chapter 4 EXPLODING DOTS (English)

Chapter 4 EXPLODING DOTS Bulgarian (Translated by Stanislav Chobanov)

Chapter 4 EXPLODING DOTS Chinese (Translated by Chee Wei Tan)

Chapter 4 EXPLODING DOTS Serbian (Translated by Aleksandra Ravas)

Chapter 4 EXPLODING DOTS Spanish (Translated by Cindy Weitzman)

COMING SOON:

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!

## Books

Take your understanding to the next level with easy to understand books by James Tanton.

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## Guides & Solutions

Dive deeper into key topics through detailed, easy to follow guides and solution sets.

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