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Number Series Flashcards

6 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 6 Number Series flashcards as text

  1. Find the next number: 81, 27, 9, 3, ___?

    Answer: 1

    Each term is divided by 3: 81÷3=27, 27÷3=9, 9÷3=3, 3÷3=1.

  2. Complete the series: 2, 3, 5, 8, 12, ___?

    Answer: 17

    The differences increase by 1: +1, +2, +3, +4, +5. So 12+5=17.

  3. What is the missing term: 4, 8, 16, 32, ___, 128?

    Answer: 64

    Each term doubles: 32×2=64, and 64×2=128 confirms this.

  4. Identify the next number: 1, 1, 2, 3, 5, 8, ___?

    Answer: 13

    This is the Fibonacci sequence where each term = sum of the two preceding terms: 5+8=13.

  5. Find the next term: 144, 121, 100, 81, 64, ___?

    Answer: 49

    These are perfect squares in descending order: 12², 11², 10², 9², 8², 7²=49.

  6. What comes next: 3, 7, 15, 31, 63, ___?

    Answer: 127

    Each term is doubled and 1 is added: 63×2+1=127.