Exploding Dots

5.1 Welcome

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:

<<LINKS TO ACCESS OR DOWNLOAD THE MATERIAL LISTED HERE COMING SOON>>

  • A PDF teacher guide for this experience: English, Serbian, Croatian, Chinese.
  • A PDF of all the written text in this experience (no commentary)
  • A PDF teacher guide for all nine experiences together

APPLICATIONS:

  • Scolab’s Spectacular Full Interactive Experience
  • Exploding Dots for Wolfram Users by Wolfram Users
  • Exploding Dots for GeoGebra Users by GeoGebra Users
  • Ulrich Kortenkamp’s App
  • Ken Wessen’s App
  • Chee Wei Tan’s App

Please join the conversation on Facebook and Twitter and kindly share this page using the buttons below.


Share on FacebookTweet about this on Twitter

Resources

resources

Books

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

BROWSE BOOKSarrow

resources

Guides & Solutions

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

BROWSE GUIDESarrow

light bulb

Donations

Consider supporting G'Day Math! with a donation, of any amount.

Your support is so much appreciated and enables the continued creation of great course content. Thanks!

heart

Ready to Help?

Donations can be made via PayPal and major credit cards. A PayPal account is not required. Many thanks!

DONATEarrow