Show students multiple examples of iteration in Scratch to help them understand and recognize more abstract programming patterns.

Helping students identify and understand similarities between pieces of code that use iteration will improve their understanding of iteration, loops, and variables.
Applying and customizing programming patterns, like iteration, is a powerful tool for programmers.
All of the scripts below have the same overarching structure, iteration.

Say the numbers from 0 to 9. (top right)

Check out Colleen’s June 2015 Scratch Meetup video for more details about counting from 0 to 9 using a repeat block!

Play a scale. (bottom right)

Check out Colleen’s YouTube video Playing Scales: With and Without Variables for more information!

Change the tempo of a playing drum. (bottom left)

Check out Colleen’s YouTube video Changing the Tempo in A Repeat for more information!

Increase the size of dots. (top left)

Check out Colleen’s YouTube video Increasing Dots Using Iteration about changing the size of dots using a repeat block!

Top left: set pen size to (5), repeat (10): pen down, pen up, move (30) steps, change pen size by (5). Top right: set (my number) to (10), repeat (11): say (my number) for (0.5) secs, change (my number) by (-1). Bottom left: set tempo to (60) bpm, repeat (10): play drum (1) for (1) beats, change tempo by (20). Bottom right: set (my note) to (60), repeat (10): play note (my note) for (0.5) beats, change (my note) by 1

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External Source

Colleen Lewis' CS10K Scratch Webinar

Other Tips By

Other Tips By Colleen Lewis