Sequences & PatternsATI TEAS 7 cheat sheet

Finding the rule

8 key facts Reviewed Oct 2026

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Arithmetic

Add or subtract the same amount each time
2, 5, 8, 11 — common difference 3
nth term = first + (n − 1) × difference

Geometric

Multiply or divide by the same factor
3, 6, 12, 24 — common ratio 2

Finding The Rule

Check differences first; if constant it is arithmetic
If ratios are constant it is geometric

Other Patterns

Squares, cubes, alternating signs

Key takeaway

Finding the rule

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