Create procedures. Use them to make 'whirly' patterns.
Large display (see weekly plan) with marker pens. Group work following whole-class introduction.
The main activity depends on computer access, so is best run alongside other work, as time permits.
Revision / oral
Recap the 'rules' for drawing regular polygons and stars.What do we mean by a regular shape? Quick-fire questions: Six-pointed star - right 150 degrees - left what? Enter this, to check it's correct.
Procedure, TO, END, EDIT
Show on the display how to define a procedure. Stress the benefit of using a short name that you'll recognise! Refer to the How to... sheet on procedures, and have this available by the computers.
>REPEAT 6 [FD 25 RT 60]
Show that the computer now knows a new word:
CS HEX FD 25 HEX and so on.
Show the class how to edit a procedure, e.g. to make the hexagon bigger.
For now, simply say that the 'label' stops the computer trying to draw another hexagon!
Use the HEX command to draw a whirly pattern:
REPEAT 12 [HEX RT 30]
Why REPEAT 12? Why RT 30? Good revision of earlier work!
Children plan a whirly pattern based on their favourite polygon. Try this on the computer and print. Record the Logo commands.
Extension: do the same with your favourite star!
Give the children suggestions based on the simplest shapes and easily- remembered turns. Check they fully understand 360 degrees as a whole turn.
Once children have made patterns, ask them to write procedures to draw a rectangle and a rhombus. It is a good idea to model on paper first. This is a good follow-up assessment activity. Can they break down the problem?
Children report on their work. Using the large display, show their patterns and talk about how they were produced.