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Aptitude Number Series 1 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.

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  1. What is the next number in the series: 4, 8, 16, 32, 64, ___?

    Answer: 128

    Each term is multiplied by 2. Starting at 4: 4×2=8, 8×2=16, 16×2=32, 32×2=64, and 64×2=128.

  2. Find the missing number: 50, 44, 38, 32, 26, ___?

    Answer: 20

    Each term decreases by 6. 50−6=44, 44−6=38, 38−6=32, 32−6=26, and 26−6=20.

  3. What comes next in the series: 1, 4, 9, 16, 25, ___?

    Answer: 36

    Each term is a perfect square: 1²=1, 2²=4, 3²=9, 4²=16, 5²=25, and 6²=36.

  4. Identify the next term in the series: 3, 7, 13, 21, 31, ___?

    Answer: 43

    The differences between consecutive terms increase by 2 each time: +4, +6, +8, +10, +12. So 31+12=43.

  5. What is the next number: 2, 6, 18, 54, 162, ___?

    Answer: 486

    Each term is multiplied by 3: 2×3=6, 6×3=18, 18×3=54, 54×3=162, and 162×3=486.

  6. What comes next in the series: 10, 20, 30, 50, 80, ___?

    Answer: 130

    Each term is the sum of the two preceding terms: 10+20=30, 20+30=50, 30+50=80, and 50+80=130.