🔮 Algebra Realm · Sequences

Cube numbers

Cube numbers focuses on how to recognise cube numbers as n × n × n and connect them to three-dimensional arrays. In this lesson, focus on a sequence records values in order.

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Understand Cube numbers

Cube numbers focuses on how to recognise cube numbers as n × n × n and connect them to three-dimensional arrays. In this lesson, focus on a sequence records values in order.

A sequence records values in order. A term-to-term rule explains the move from one term to the next, while the positions keep the order visible. For cube numbers, the final written answer should make that exact relationship visible rather than hiding it inside an unexplained result.

Start here

Cube numbers: A sequence records values in order. Use the rule to regenerate at least two terms already shown in the sequence. Keep the cube numbers representation visible until the final line.

Picture the idea

Run terms through a sequence machine and compare a step-by-step growth view with a position-to-term table. Use the model to explain one change you notice while working on cube numbers.

Check as you go

Use the rule to regenerate at least two terms already shown in the sequence. Write that check beside the final cube numbers answer.

Key vocabulary

Rules and key facts

The 3rd cube number is 3³ = 27.

List positions above the terms.
Inspect the change pattern or substitute the required position.
Apply the rule carefully to the requested term.
Check against known terms before extending the pattern. Record the check explicitly for cube numbers.

Step-by-step method

List positions above the terms.
Inspect the change pattern or substitute the required position.
Apply the rule carefully to the requested term.
Check against known terms before extending the pattern. Record the check explicitly for cube numbers.

What you need first

Recognise the vocabulary: term, position, difference.
Be able to explain the purpose of cube numbers before calculating.
Keep the relevant values, units and representation visible while you work.

Real-world use

Tile patterns
Predicting repeated growth

Visual / interactive

See the idea, then move it around

Skip to Practice

Run terms through a sequence machine and compare a step-by-step growth view with a position-to-term table. Use the model to explain one change you notice while working on cube numbers.

Interactive maths model Connected to this topic; move controls, check outputs, then earn XP only from verified actions.

Responsive · validated · topic linked

Worked examples

Examples, methods and exam thinking

Level 1 · Foundation

Understand the idea with small numbers, one representation and one clear step.

Level 2 · Secure

Use the standard Year 8 method with mixed examples and normal wording.

Level 3 · Challenge

Handle multi-step or less familiar questions and explain choices.

Level 4 · Exam-style

Solve a worded question, show reasoning, check accuracy and write a final sentence.

Foundation example

Build confidence

Given information: Cube numbers — The sequence starts 3, 5, 7. Find the next term. Method choice: use the cube numbers method and show each step with the stated values. Calculation or reasoning: The common difference is 2. Add 2 once more: 7 + 2 = 9. Final answer: 9. Check: substitute or compare with the original information to confirm the result fits the question.

List positions above the terms.
Inspect the change pattern or substitute the required position.
Apply the rule carefully to the requested term.

Secure example

Use the normal method

Given information: Cube numbers — The sequence starts 3, 17, 31. Find the next term. Method choice: use the cube numbers method and show each step with the stated values. Calculation or reasoning: The common difference is 14. Add 14 once more: 31 + 14 = 45. Final answer: 45. Check: substitute or compare with the original information to confirm the result fits the question.

Check: Use known cubes to recognise perfect cube numbers.

Challenge example

Stretch the idea

Given information: Cube numbers — The sequence starts 3, 16, 29. Find the next term. Method choice: use the cube numbers method and show each step with the stated values. Calculation or reasoning: The common difference is 13. Add 13 once more: 29 + 13 = 42. Final answer: 42. Check: substitute or compare with the original information to confirm the result fits the question.

Try explaining why each step works before checking the answer.

Exam-style example

Show your reasoning

Given information: Cube numbers — The sequence starts 3, 15, 27. Find the next term. Method choice: use the cube numbers method and show each step with the stated values. Calculation or reasoning: The common difference is 12. Add 12 once more: 27 + 12 = 39. Final answer: 39. Check: substitute or compare with the original information to confirm the result fits the question.

Common mistakes

Using a term-to-term rule as if it were an nth-term formula. This is a key trap when answering cube numbers questions.
Starting position counting at zero without being told.

How to check your answer

Use the rule to regenerate at least two terms already shown in the sequence. Write that check beside the final cube numbers answer.

Extension challenge

Create a cube numbers problem with a tempting incorrect answer. Solve it, apply the check, and explain exactly where the incorrect method breaks down.

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Cube numbers challenge

Use sequence machine controls to solve three checked cube numbers rounds. Solve at least two of three marked rounds and use feedback to correct any error.

Press Start Game to enter a topic-specific maths arena.

Boss challenge

Challenge Cube numbers Arcane Boss

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Cube numbers Arcane Boss

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Study cards

Core idea

Cube numbers: A sequence records values in order. Use the rule to regenerate at least two terms already shown in the sequence. Keep the cube numbers representation visible until the final line.

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Key vocabulary

term · position · difference · term-to-term rule · nth term · cube · numbers

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Rules

List positions above the terms. Inspect the change pattern or substitute the required position. Apply the rule carefully to the requested term. Check against known terms before extending the pattern. Record the check explicitly for cube numbers.

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Formula / fact

The 3rd cube number is 3³ = 27.

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Foundation example

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Secure example

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Challenge example

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Exam-style example

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Common mistake

Using a term-to-term rule as if it were an nth-term formula. This is a key trap when answering cube numbers questions.

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Exam tip

For cube numbers, show the key representation before the final calculation. Use this final check: Use the rule to regenerate at least two terms already shown in the sequence.

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Real-world use

Tile patterns, Predicting repeated growth

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Checklist

I can explain cube numbers, use the method, check for mistakes, and answer an exam-style question.

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Flashcards

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Help for Cube numbers

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Simple explanation

Cube numbers: A sequence records values in order. Use the rule to regenerate at least two terms already shown in the sequence. Keep the cube numbers representation visible until the final line.

Think of cube numbers as a careful model: make the important values visible, change one thing at a time, and use the check to prove the answer fits.

Step-by-step breakdown

List positions above the terms.
Inspect the change pattern or substitute the required position.
Apply the rule carefully to the requested term.
Check against known terms before extending the pattern. Record the check explicitly for cube numbers.

Hint 1

Start by naming the given information and the exact result required for cube numbers.

Hint 2

List positions above the terms.

Full worked solution

Method: List positions above the terms. → Inspect the change pattern or substitute the required position. → Apply the rule carefully to the requested term. → Check against known terms before extending the pattern. Record the check explicitly for cube numbers.

Common mistake warning

Using a term-to-term rule as if it were an nth-term formula. This is a key trap when answering cube numbers questions.

Choose a support button above when you need a nudge.

Mastery milestones

Badges reward learning, not locked clicking

I can explain cube numbers in my own words.
I can use these words accurately: term, position, difference.
I can follow the 4-step method without guessing.
I can avoid this mistake: Using a term-to-term rule as if it were an nth-term formula.
I can apply this check: Use the rule to regenerate at least two terms already shown in the sequence.

🥉 Bronze Badge Foundation level completed

🥈 Silver Badge Apprentice level completed

🥇 Gold Badge Skilled level completed

💎 Platinum Badge Mastery test passed

🐉 Legendary Badge Boss battle defeated