This project links pencil and paper to Scratch code (it links known to unknown, familiar to new!) It shows how to write code that calculates the area and perimeter of a circle on the grid. This would not be easy to do without the grid. Instead of pixels, the stage is a grid of 24x18 squares. CLICK SEE INSIDE. Don't you think the the code is quite simple and intuitive? But, try it without the grid! Drag the slider to set the number of squares for the radius. The slider maximum keeps the largest possible circle inside the stage boundaries.The original project used 'when SPACE key pressed' to actvate the drawing. But with iPads the keyboard intrudes. Read below.
NOTE about the Button: Scratch can be used on iPads but the keyboard can intrude and cover half the screen. To get around this, instead of 'pressing the SPACEBAR' I've very simply programmed the green button instead. (See inside for the code) Fine line vector grids open up many opportunities to maximise the potential of Scratch as a methodology for maths teaching using SCRATCH with the READY-STEADY-CODE grids by Seamus O'Neill
