← Years 5–6 Creating Digital Solutions

Sequence: steps in order

Steps that run one after another in a set order. Changing the order, leaving a step out or adding an extra step can change the result.

Part of: 5-6 Digital Technologies Vic Curric - Creating Digital Solutions — Module 9, VCE Applied Computing U1O2 Programming: Control structures — Module 1, IGCSE Computer Science 0478 — 8.1b Sequence, Selection and Iteration — Module 1, ACARA Digital Technologies Years 5–6 — Algorithms with Branching and Repetition — Module 2, ACARA Digital Technologies Years 7–8 — Tracing and Debugging Algorithms — Module 47, WA Computer Science ATAR Year 11 — Pseudocode and Algorithm Design — Module 22

Understanding Sequence: steps in order in Years 5–6 Creating Digital Solutions

What it does: The step 'Type the message' is left out, so Send has nothing to send. A missing step changes the result. Each step happens in a sensible order, so the sequence works. Putting the steps in the right order is the key to a correct sequence. Changing the order changes the result. If you rinse first, you finish with a mouth full of toothpaste. This one is tricky. Leaving out a step like setting up your space can cause problems. Always check that no steps are missing. An extra step that does not help the goal can change the result or waste time. Remove it to fix the sequence.

Common mistakes: The steps are in the wrong order. The butter is spread before the bread is toasted. Line 2 should be 'Put bread in the toaster'. This is an extra step. The toothpaste was already added in step 2, so adding it again after brushing is not needed. Line 4 should be 'Spit into the sink'.

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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

Making toast: 1. Put bread in toaster 2. Push the lever down 3. Spread butter. Is this order correct for a sequence?

Yes, each step comes in an order that worksNo, butter must go on before the bread is toasted

Matches

1. Drink the juice 2. Pour the juice 3. Get a cup

↓

The steps are in the wrong order. You must get a cup and pour the juice before you can drink it.

Applying

Meanings

Term

sequence

Meaning

Steps that run one after another in a set order. Changing the order, leaving a step out or adding an extra step can change the result.

Practice

1. Get two slices of bread

Testing

Gaps

. Put on shoes

Check Answer

Spots

11. Get two slices of bread

22. Spread butter on the toast

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Quick Questions

1. Making toast: 1. Put bread in toaster 2. Push the lever down 3. Spread butter. Is this order correct for a sequence?

A. Yes, each step comes in an order that works ✓

B. No, butter must go on before the bread is toasted

In a sequence, steps run in a set order. Toast first, then butter, gives the result we want.

2. Which sequence for brushing teeth works?

A. Put toothpaste on brush, brush teeth, rinse mouth ✓

B. Rinse mouth, brush teeth, put toothpaste on brush

Changing the order changes the result. If you rinse first, you finish with a mouth full of toothpaste.

3. True or false: In a sequence, you can swap the steps around and always get the same result.

A. True

B. False ✓

Changing the order can change the result. Putting on shoes before socks shows why.

4. A robot has these steps: 1. Move forward 2. Turn left 3. Pick up the ball. The robot is meant to pick up the ball it is standing next to, but the robot never grabs it. What is the problem?

A. A step is missing: the robot needs to pick up the ball ✓

B. The steps are not numbered

A missing step leaves a gap in the sequence, so the result is not what we planned.

5. Sequence for making a sandwich: 1. Get two slices of bread 2. Add cheese 3. Close the sandwich. What is wrong with this sequence?

A. The sequence has too many steps

B. A step is missing: nothing says to put the bread on a plate or board first ✓

This one is tricky. Leaving out a step like setting up your space can cause problems. Always check that no steps are missing.

Match the Pairs

1. Fill the kettle 2. Boil the water 3. Pour the water → A sequence: steps run one after another in a set order

1. Put on shoes 2. Put on socks → The order is wrong, so the result changes (shoes over socks)

A missing step can stop the result from working → 1. Open the app 2. Press Send

Putting steps in the right order gives the correct result → 1. Wash hands 2. Dry hands 3. Make a sandwich

1. Drink the juice 2. Pour the juice 3. Get a cup → The steps are in the wrong order. You must get a cup and pour the juice before you can drink it.

1. Turn on the computer 2. Clap three times 3. Open the game → There is an extra step. Clapping three times is not needed and does not help the sequence.

Key Term

sequence

Steps that run one after another in a set order. Changing the order, leaving a step out or adding an extra step can change the result.

Fill in the Blanks

1. 1. Put on socks 2. Put on shoes 3. Tie the laces

Hint: Type the number of the middle step in this sequence.

2. x ← 5 x ← x + 2 OUTPUT x

Hint: Type the variable name that holds the result after both steps have run.

3. x ← 2 x ← x * 3 OUTPUT x

Hint: Type the operator that multiplies the numbers.

4. x ← 3 x ← x + 4 OUTPUT x

Hint: Type the keyword that shows the value on the screen after the steps finish.

5. x ← 1 x ← x + 1 x ← x + 1

Hint: Type the assignment symbol that stores the new value, as in the line above. This extra step changes the result.

Spot the Error

Question 1

A 1. Get two slices of bread

B 2. Spread butter on the toast

C 3. Press the lever down

D 4. Wait for toast to pop up

E 5. Spread butter on the toast

Line B — The steps are in the wrong order. The butter is spread before the bread is toasted. Line 2 should be 'Put bread in the toaster'.

Question 2

A 1. Wet the toothbrush

B 2. Put toothpaste on it

C 3. Brush for two minutes

D 4. Put toothpaste on it

E 5. Rinse the toothbrush

Line D — This is an extra step. The toothpaste was already added in step 2, so adding it again after brushing is not needed. Line 4 should be 'Spit into the sink'.

Question 3

A SET score TO 0

B ADD 5 TO score

C SET score TO 0

D SHOW score

Line C — This extra step resets the score to 0 and wipes out the 5 points already added. The program would show 0 instead of 8. Line 3 should be 'ADD 3 TO score'.

Question 4

A 1. Water the soil

B 2. Drop in the seed

C 3. Cover it with soil

D 4. Water the soil

Line A — The order is wrong. You cannot water the soil in a hole that has not been dug yet. Line 1 should be 'Dig a small hole'.

Question 5

A 1. Lay out two bread slices

B 2. Spread butter on the bread

C 3. Eat the sandwich

D 4. Press the slices together

Line C — The sandwich is eaten too early, before the cheese is added and the slices are pressed together. Line 3 should be 'Add cheese to one slice'.

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