# Euler’s Formula with jubes and toothpicks

Learning Intention: To distinguish between prisms and other three-dimensional shapes and to work out the relationship between vertices, edges and faces (Euler’s Formula).

These two Year 7 students are making three-dimensional models with jubes and toothpicks (or satay sticks) to record vertices, edges and faces. Start with simple shapes, such as triangular pyramids, cubes and square pyramids, distinguishing between shapes that are prisms and those that are not. When students have made at least six or more shapes ask them to see if they can find a relationship between V (vertices); E (edges) and F (faces). I usually give a clue that they only need to use addition and subtraction (not multiplication or division).

# Windows Apps for Maths

Our Year 7 and 8 classes received Microsoft Windows tablets at the beginning of last term, as part of a DEECD trial, “Inking your Thinking”. The students have enjoyed using these devices to access Mathletics, as well as playing the “2048” game in free time at the end of a lesson. However, there are some more good Windows apps that I would like each student to download onto their devices.

Number and Algebra

• 100 chart (for prime numbers, multiples and factors)
• Prime factors
• Maths Wizard
• Easy Fractions
• Motion Maths – Fractions
• Motion Maths – Hungry Fish
• Fluid Math Online
• Dragon Box (\$5.99)

Measurement and Geometry

• Geoboard
• Math Geometry
• Geometry 101
• Solve Geometry Ver 2.0

Statistics and Probability

• Charts
• Bar Chart creator
• Linear graph