Linear number patterns and the nth term

Find the nth-term rule for a linear number pattern, use it to find any term or term number, and derive the rule from two given terms.

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Te reo Māori terms

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Learning objective overview

Master Teaching Guide coverage for this objective.

Current NZC (2007)
  • NA4-9
New NZC (2026)
  • NZC26-P4-ALG-ER-P-Y9-11
  • NZC26-P3-ALG-ER-K-Y7-08
  • NZC26-P3-ALG-ER-P-Y7-07
  • NZC26-P3-ALG-ER-P-Y7-08

Resources

Terminology

  • nth term
  • term
  • term number
  • common difference
  • first term
  • rule
  • sequence
  • spatial pattern

Task goals

  • Find the nth-term rule for a linear number pattern given its first four terms, e.g. $5,\ 8,\ 11,\ 14$.
  • Use a given nth-term rule to find a specific term, e.g. term 7 of $4n+2$.
  • Use a given nth-term rule to find which term number equals a stated value, e.g. which term of $3n+7$ equals $28$.
  • Find the nth-term rule for a growing spatial or tile pattern, then find a specific term.
  • Evaluate whether a student's stated nth-term rule for a pattern is correct, explain any error, and give the correct rule.
  • Decide whether a given number appears in a linear pattern, using the nth-term rule to justify the answer.
  • Derive the nth-term rule from two non-consecutive given terms, e.g. term 4 is $21$ and term 10 is $45$.
  • Apply nth-term rules with a negative common difference, e.g. a decreasing pattern such as $31,\ 27,\ 23,\ 19$.

Teaching guidance

  • Scope: recognising a linear pattern by a constant first difference, forming and using the nth-term rule (general term = first term + (n-1) x common difference) to find a given term or term number, and extending the pattern -- consolidating the linear-pattern strand of extrapolating linear, quadratic, and exponential patterns; identifying linear, quadratic, and exponential patterns; and determining the nth term of a pattern or spatial pattern into one Year-10-branded page.
  • Task decks should cover: extending a linear sequence from its first difference; writing an nth-term rule from a sequence of numbers or a spatial/matchstick pattern; using an nth-term rule to find a given term or to find which term number equals a given value; and, at excellence tier, deciding whether a given value is a term of the sequence.

Where this fits

What leads into this objective, and where it goes next.

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Linear number patterns and the nth term

Linear number patterns and the nth term

Do

Identifying the constant increase or decrease in a linear pattern, using variables and algebraic notation to represent the rule in an equation, and drawing on the rule to make conjectures

Statement▸
Year 9 · Algebra · Equations and relationships
NZC26-P4-ALG-ER-P-Y9-11

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