← Years 5–6 Creating Digital Solutions

Algorithm

A set of clear steps, in order, that solves a problem or completes a task, like a recipe or morning routine. Each step must be precise so a person or computer can follow it.

Part of: 5-6 Digital Technologies Vic Curric - Creating Digital Solutions — Module 8, 7-8 Digital Technologies: Designing and tracing algorithms — Module 1, VCE Applied Computing U1O2 Programming: Requirements and design tools — Module 6, IGCSE Computer Science 0478 — 7b Decomposition and Sub-systems — Module 24, IGCSE Computer Science 0478 — 7d Standard Methods of Solution — Module 1, ACARA Digital Technologies Years 5–6 — Algorithms with Branching and Repetition — Module 1, ACARA Digital Technologies Years 7–8 — Algorithms, Flowcharts and Pseudocode — Module 1, QCE Digital Solutions Unit 1 — Algorithms and Programming Techniques — Module 1

Understanding Algorithm in Years 5–6 Creating Digital Solutions

What it does: A morning routine is a set of ordered steps to complete a task, so it is an algorithm for people. A computer cannot guess what you mean, so each step must say exactly what to do. A recipe lists steps in order to get a result, so it is an algorithm. A photo shows no steps. Routines are algorithms too. People follow algorithms every day, not just computers. The order of steps matters. You cannot put the bread together before you have got it. Precise steps give exact details, like a number. Vague steps such as 'over there' cannot be followed properly.

Common mistakes: The steps are out of order. The toast is not made yet, so step 3 should be 'Push the lever down'. Buttering comes after the toast pops up. 'Some stuff' is not precise. Nobody can tell what to add or how much. It should say exactly what to do, like 'Pour 1 cup of cereal in bowl'.

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This module's key terms are also in a printable crossword (Modules 1–10) and word search (Modules 1–20).

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Learning
Duo
Which best describes an algorithm?
A set of clear steps, in order, that completes a taskA random list of ideas about a task
Matches
1. Eat the cake 2. Mix the batter 3. Bake the cake
↓
The steps are in the wrong order. You cannot eat the cake before you mix and bake it.
Applying
Meanings
Term
algorithm
Meaning
A set of clear steps, in order, that solves a problem or completes a task, like a recipe or morning routine. Each step must be precise so a person or computer can follow it.
Practice
ALGORITHM Make toast
Testing
Gaps
An is a set of clear steps.
Check Answer
Spots
22. Put bread in the toaster
33. Spread butter on the toast

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Quick Questions

1. Which best describes an algorithm?
A. A set of clear steps, in order, that completes a task ✓
B. A random list of ideas about a task
An algorithm is a set of clear steps in a sensible order that solves a problem or completes a task.
2. Which one is an example of an algorithm?
A. A photo of a piece of toast
B. A recipe for making toast, with each step in order ✓
A recipe lists steps in order to get a result, so it is an algorithm. A photo shows no steps.
3. True or false: Your morning routine can be an algorithm.
A. False: only computers can use algorithms
B. True: wake up, brush teeth, get dressed, eat breakfast ✓
Routines are algorithms too. People follow algorithms every day, not just computers.
4. Which set of steps is in the right order for an algorithm to make a sandwich?
A. Get bread, add filling, put the bread together ✓
B. Put the bread together, get bread, add filling
The order of steps matters. You cannot put the bread together before you have got it.
5. Which step is precise enough for a computer to follow?
A. Move forward 3 steps ✓
B. Go over there somewhere
Precise steps give exact details, like a number. Vague steps such as 'over there' cannot be followed properly.

Match the Pairs

1. Get bread 2. Add peanut butter 3. Close sandwich → A recipe written as numbered steps in order is an algorithm
Move forward 3 steps → A precise step that a person or computer can follow exactly
A morning routine is an algorithm for a person because it lists steps in order → 1. Wake up 2. Brush teeth 3. Get dressed 4. Eat breakfast
An algorithm for a computer must be precise, with no guessing needed → Set score to 0 Add 1 to score
1. Eat the cake 2. Mix the batter 3. Bake the cake → The steps are in the wrong order. You cannot eat the cake before you mix and bake it.
1. Make it good 2. Do the thing → The steps are vague. 'Make it good' and 'Do the thing' do not say exactly what to do.

Key Term

algorithm
A set of clear steps, in order, that solves a problem or completes a task, like a recipe or morning routine. Each step must be precise so a person or computer can follow it.

Fill in the Blanks

1. An algorithm is a set of clear steps.
Hint: Type the word for a set of clear steps that solves a problem.
2. 1. Get two slices of bread 2. Spread butter on the bread 3. Put the bread in the toaster
Hint: Type the step number that keeps the steps in order.
3. Each step must be precise and clear.
Hint: Type the word that means exact, with no guessing needed.
4. A recipe lists steps to follow in order.
Hint: Type the word for the individual actions in an algorithm.
5. Computers and people can follow algorithms.
Hint: Type who else can follow an algorithm besides computers.

Spot the Error

Question 1
A 1. Get bread from the bag
B 2. Put bread in the toaster
C 3. Spread butter on the toast
D 4. Take out the toast
Line C — The steps are out of order. The toast is not made yet, so step 3 should be 'Push the lever down'. Buttering comes after the toast pops up.
Question 2
A 1. Get a bowl
B 2. Add some stuff to the bowl
C 3. Add half a cup of milk
Line B — 'Some stuff' is not precise. Nobody can tell what to add or how much. It should say exactly what to do, like 'Pour 1 cup of cereal in bowl'.
Question 3
A 1. Ask for the first number
B 2. Ask for the first number again
C 3. Add the two numbers
D 4. Show the answer
Line B — Step 2 asks for the first number twice, so the computer never gets a second number to add. It should be 'Ask for the second number'.
Question 4
A 1. Wet your toothbrush
B 2. Put toothpaste on brush
C 3. Brush for a while
D 4. Rinse your mouth
Line C — 'A while' is not precise because people would brush for different times. A clear step gives an exact time: 'Brush for two minutes'.
Question 5
A 1. Empty the watering can
B 2. Carry it to the plant
C 3. Pour water on the soil
Line A — There would be no water left to pour in step 3. The first step must be 'Fill the watering can' so the steps work in order.

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