Year 4 - Computing
Count-controlled loops
Repetition in programs
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will create text-based programs which use repetition. They will plan, modify, and test commands to create shapes and patterns. They will explore the different types of loops that can be used to repeat commands in a program.
Lesson Summary
You will learn to modify a count-controlled loop to produce a given outcome.
Key Notes
- Changing the number of repetitions in a count-controlled loop changes the outcome.
- The outcome of a program containing a count-controlled loop can be predicted.
- Changing a value of a command will have an effect on a loop.
Vocabulary To Learn
- value: a number that is used in a command
- count-controlled loop: a chunk of code that repeatedly runs a section of the program a certain number of times
- trace: carefully following a program line by line to predict what it will do
Common Mistakes To Avoid
- A loop with a high number always makes a big shape.
3 Quick Questions (With Answers)
1. Describe the system or process from this lesson in clear steps.
Changing the number of repetitions in a count-controlled loop changes the outcome. The outcome of a program containing a count-controlled loop can be predicted.
2. Define this computing term and give one practical example. 'value'
a number that is used in a command. Add one real device or system example to prove understanding.
3. Correct this common computing misconception.
Mistake: A loop with a high number always makes a big shape. Correction: The number in the loop affects the number of sides, not the size. The fd value controls the size.
More Lessons In This Unit
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