Patterns and Sequences Flashcards

Grade 3 · Math · Flashcards

Key vocabulary and practice for identifying and extending number patterns.

Flashcards

Pattern: A sequence that follows a predictable rule.
Term: One item in a pattern or sequence.
Repeating pattern: A core that cycles. Ex: A, B, A, B...
Growing pattern: Increases by a consistent rule. Ex: 2, 4, 6, 8 (add 2).
Shrinking pattern: Decreases by a consistent rule. Ex: 20, 15, 10, 5 (subtract 5).
Rule: add 3: 3, 6, 9, 12, 15, 18...
Rule: add 4: 4, 8, 12, 16, 20, 24...
Rule: multiply by 2: 1, 2, 4, 8, 16, 32...
Rule: subtract 10: 100, 90, 80, 70, 60...
How to find a rule: Subtract consecutive terms (addition rule) or divide them (multiplication rule).
Next term in 5, 10, 15, 20: 25 — rule is add 5.
Next term in 3, 9, 27, 81: 243 — rule is multiply by 3.
Missing term in 12, ___, 18, 21: 15 — rule is add 3.