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Number Sequences and Patterns Flashcards

7 cards from real IBEW practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Number Sequences and Patterns flashcards as text

  1. What number is missing: 2, 3, 5, 8, 13, ___, 34?

    Answer: 21

    This is the Fibonacci sequence where each term is the sum of the two previous terms: 8 + 13 = 21.

  2. Find the next number: 1, 8, 27, 64, 125, ___?

    Answer: 216

    These are perfect cubes (1³, 2³, 3³…), so the next is 6³ = 216.

  3. What is the next term: 50, 45, 39, 32, 24, ___?

    Answer: 15

    The differences decrease by 1 each time (−5, −6, −7, −8, −9), so 24 − 9 = 15.

  4. Which value completes the sequence: 4, 7, 12, 19, 28, ___?

    Answer: 39

    The differences increase by 2 each time (+3, +5, +7, +9, +11), so 28 + 11 = 39.

  5. Find the missing number: 6, 12, 10, 20, 18, 36, ___?

    Answer: 34

    The pattern alternates: ×2 then −2, so 36 − 2 = 34.

  6. What comes next in the series: 3, 9, 27, 81, ___?

    Answer: 243

    Each term is multiplied by 3, so 81 × 3 = 243.

  7. What is the next number: 17, 14, 11, 8, 5, ___?

    Answer: 2

    Each term decreases by 3, so 5 − 3 = 2.

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