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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. What is the next number in the series: 3, 6, 12, 24, 48, ___?

    Answer: 96

    Each term is multiplied by 2: 3×2=6, 6×2=12, 12×2=24, 24×2=48, 48×2=96.

  2. Complete the series: 100, 91, 83, 76, 70, ___?

    Answer: 65

    The differences decrease by 1 each step: -9, -8, -7, -6, so next difference is -5: 70-5=65.

  3. Find the missing number: 2, 5, 11, 23, ___, 95

    Answer: 47

    Each term is doubled and 1 is added: 2×2+1=5, 5×2+1=11, 11×2+1=23, 23×2+1=47.

  4. What comes next: 1, 4, 9, 16, 25, ___?

    Answer: 36

    These are perfect squares: 1²=1, 2²=4, 3²=9, 4²=16, 5²=25, 6²=36.

  5. Identify the next term: 7, 14, 28, 56, 112, ___?

    Answer: 224

    Each term is multiplied by 2: 112×2=224.

  6. What is the missing number: 5, 10, 20, ___, 80, 160?

    Answer: 40

    Each term is doubled: 5, 10, 20, 40, 80, 160.