Search Mathematics Centre ... Big Picture ... News ... Research & Stories ... Cube Tube ... Indigenous Students ... Web Papers ... Contacts ... Site Map Resources & Ordering ... Poly Plug ... Task Cameos ... Menu Maths ... Maths With Attitude ... Working Mathematically with Infants ... Sphinx Album

# News

## October 2015

In this edition of the News you will find:

Task 219, The Hole In The Triangle

Please feel free to distribute this information.

Email News Services
If you would like to subscribe please send an email request to: doug@blackdouglas.com.au:
• In the subject line write Subscribe Maths.
• In the body of message state which divisions you want to subscribe to, or simply write Subscribe All.
Update messages are sent from:
Mathematics Centre monthly
Calculating Changes bi-monthly
Maths300 update news as it happens
Working with Mathematics Centre
Browsing Hint
Use the View/Zoom options of your browser to 'move' the page closer or further away. Ctrl +, Ctrl - and Ctrl 0.

Two new cameos this month.
The Task Cameo Content Finder has been updated to include these tasks.

• Guessing Colours Game Count a total number of discs (in this case 15) using five colours and any number of each to make the total. Hide them in an opaque bag. Students take turns to select a disc from the bag, but first they each have to guess which colour will come out. A points scoring system is involved and a running total of points is kept for each player until all the discs are removed. The game involves simple addition and subtraction, may include negative numbers and is an excellent experience of chance events and sample space.
• The Hole In The Triangle appears to make the same size triangle in two different ways with the same pieces. The twist is that one of the triangles clearly has an area one square bigger than the other. It just can't be, but only mathematics can help us understand how we are being tricked and why the apparent difference is exactly one square unit of area.

Click a photo to access its cameo, or access all current cameos through the Link List below.

Keep smiling,
Doug.

• Did you miss the Previous News?
If so you missed information about: