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Describe pattern rules

A pattern rule describes the consistent relationship that generates successive terms in a whole-number sequence or successive elements in a growing or repeating shape pattern, using words, tables, or simple operations such as adding, subtracting, multiplying, or dividing by a fixed whole number. The rule supports finding missing terms and predicting later terms while distinguishing the rule from merely naming the next term; formal variables, equations, and more complex generalized rules are beyond this scope.

Detailed Explanation: Describe pattern rules

A pattern rule tells how to get from one term to the next. It is more than just naming the next number.

Example:
Find the missing terms and describe the rule.

4, 8, 12, 16, □, □4,\ 8,\ 12,\ 16,\ \square,\ \square

Step 1: Compare neighboring terms.

  • 44 to 88: add 44
  • 88 to 1212: add 44
  • 1212 to 1616: add 44

The same change happens each time.

Step 2: State the rule.

The rule is: add 44 to get the next term.

Step 3: Use the rule to find the missing terms.

  • 16+4=2016+4=20
  • 20+4=2420+4=24

So the completed pattern is

4, 8, 12, 16, 20, 244,\ 8,\ 12,\ 16,\ 20,\ 24

The pattern rule is add 44 each time, and the next term after 2424 would be 2828.

Learn by doing: Describe pattern rules

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Patterning - Rule for Geometric Pattern


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