Computer Science
Grade 7
20 min
Lesson 4: Pseudocode: Writing Algorithms in Plain English
Introduce pseudocode as a way to describe algorithms without using specific programming language syntax.
What you'll learn
- Identify and define at least three common pseudocode keywords (e.g., INPUT, OUTPUT, IF, WHILE) with 80% accuracy on a quiz.
- Explain, in their own words, the purpose of pseudocode and how it differs from actual programming code, as demonstrated through a short written paragraph evaluated using a rubric.
- Apply pseudocode to design a simple algorithm (e.g., calculating the average of three numbers, determining if a number is even or odd) that produces the correct output in at least 2 out of 3 given scenarios.
- Translate a given real-world problem (e.g., making a sandwich, sorting a deck of cards) into a step-by-step algorithm expressed in pseudocode, demonstrating logical flow and clear instructions, as assessed by a teacher checklist.
Tutorial Preview
1
Introduction & Learning Objectives
Learning Objectives
Define pseudocode and explain its purpose in program planning.
Differentiate between pseudocode and a formal programming language like Python or JavaScript.
Write a simple sequential algorithm using standard pseudocode keywords.
Use IF/THEN/ELSE structures in pseudocode to represent decisions.
Use WHILE loops in pseudocode to represent repetition.
Translate a real-world task into a clear, step-by-step pseudocode algorithm.
Ever tried to explain a TikTok dance to a friend who just doesn't get it? 🕺 What if you could write the steps so perfectly that even a robot could do it?
In this lesson, you'll learn how to write instructions for computers using a special kind of 'fake code' called pseudocode. It's a powerful tool that helps y...
2
Key Concepts & Vocabulary
TermDefinitionExample
AlgorithmA set of step-by-step instructions designed to perform a specific task or solve a problem.A recipe for baking a cake is an algorithm. You follow the steps in order to get the final result.
PseudocodeA way of writing an algorithm using a mix of plain English and simple programming-like keywords. It's a 'draft' for your real code.Instead of complex code, you might write: `GET user_age. IF user_age < 13 THEN PRINT 'Access denied.'`
SequenceThe order in which instructions are executed, one after another, from top to bottom.1. `GET bread`. 2. `GET peanut butter`. 3. `SPREAD peanut butter on bread`.
Selection (Condition)A decision point in an algorithm that allows it to follow different paths based on whether a condition is true or fals...
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Core Syntax & Patterns
Keywords for Actions
Use capitalized, clear action words: `GET`, `SET`, `PRINT`, `CALCULATE`, `READ`, `DISPLAY`.
Use these common keywords to represent computer actions like getting input, setting a variable's value, or displaying output. This makes your pseudocode easy for anyone to read and understand.
IF/THEN/ELSE for Decisions
`IF [condition is true] THEN [do this action] ELSE [do this other action] ENDIF`
Use this structure to show a decision. The computer checks the condition. If it's true, it does the 'THEN' part. If it's false, it does the 'ELSE' part. The `ELSE` is optional.
WHILE/DO/ENDWHILE for Loops
`WHILE [condition is true] DO [repeat these actions] ENDWHILE`
Use this to repeat a block of instructions. The computer che...
4 more steps in this tutorial
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Challenging
What is the final output of this pseudocode? `SET count = 1 SET message = "" WHILE count <= 3 DO IF count == 2 THEN SET message = message + "B" ELSE SET message = message + "A" ENDIF SET count = count + 1 ENDWHILE PRINT message`
A.A
B.AB
C.ABA
D.AAB
Challenging
The 'Homework Checker' algorithm needs to stop ONLY when the user types 'yes'. What is the logical flaw in this version? `SET homework_done = "no" WHILE homework_done == "no" DO PRINT "Is your homework done?" GET homework_done ENDWHILE`
A.It will stop if the user types anything other than 'no', such as 'yep' or 'finished'.
B.It will never stop because `homework_done` is always 'no'.
C.It will not ask the question the first time.
D.The `GET` command should be outside the loop.
Challenging
An algorithm for a guessing game is written as follows: `SET secret_number = 7 GET user_guess WHILE user_guess != secret_number DO IF user_guess < secret_number THEN PRINT "Too low!" ELSE PRINT "Too high!" ENDIF ENDWHILE PRINT "You got it!"` What is the critical flaw in this algorithm's logic?
A.The `secret_number` should be a variable, not a fixed number.
B.It will print 'Too high!' even when the guess is correct.
C.It uses an `IF/ELSE` statement inside a `WHILE` loop, which is not allowed.
D.It never asks the user for a new guess inside the loop, creating an infinite loop if the first guess is wrong.
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Lesson 4: Pseudocode: Writing Algorithms in Plain English is a Grade 7 Computer Science lesson on ExcelOS.
What will I learn in Lesson 4: Pseudocode: Writing Algorithms in Plain English?
You'll be able to: Identify and define at least three common pseudocode keywords (e.g., INPUT, OUTPUT, IF, WHILE) with 80% accuracy on a quiz; Explain, in their own words, the purpose of pseudocode and how it differs from actual programming code….
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How many practice questions are included with Lesson 4: Pseudocode: Writing Algorithms in Plain English?
This lesson includes 27 practice questions across multiple difficulty levels, each with instant feedback and explanations.