40 maths shapes challenges

Forty shapes to make in Scratch or some other version of logo, such as Turtle Art. It's hard to see the thumbnail but click on it for a larger view.

This is one of the best sheets ever for teaching maths (designed by Barry Newell):

• the logo turtle or scratch cat acts as a transitional object between the concrete maths shape and the abstraction of the script that makes the shape
• the sheet includes both simple and complex shapes, increasing in order of complexity, there is a challenge there for everyone
• many of the more complex shapes are made up of combinations of the simpler shapes

Source: Barry Newell's Turtle Confusion (1988)