Number patterns

Strategy card

Model the sequence: arithmetic, geometric, polynomial, recursive or interleaved.

1. 1Step 1: Check first and second differences and ratios.
2. 2Step 2: Consider position-based rules (n², 2ⁿ, n(n+1)).
3. 3Step 3: Consider recursive rules (each term from the previous one or two).
4. 4Step 4: Verify the rule on all terms; one exception means it's wrong.

💡 Tip: Write the term number above each term: rules often depend on position.