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Number Series Flashcards

6 cards from real PSEE 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 term: 7, 14, 28, 56, ___

    Answer: 112

    Each term doubles: 56×2=112.

  2. What is the missing number? 3, 7, 15, 31, ___, 127

    Answer: 63

    Each term = previous × 2 + 1: 31×2+1=63, 63×2+1=127.

  3. What comes next in the series? 1, 4, 9, 16, 25, 36, 49, ___

    Answer: 64

    Perfect squares: 1², 2², ..., 7²=49, 8²=64.

  4. Complete the series: 5, 10, 20, 35, 55, ___

    Answer: 80

    Differences: +5, +10, +15, +20 — increasing by 5 each step. Next difference: +25. 55+25=80.

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

    Answer: 162

    Each term is multiplied by 3: 54×3=162.

  6. Identify the missing number: 144, 121, 100, 81, ___, 49

    Answer: 64

    Descending perfect squares: 12²=144, 11²=121, ..., 8²=64, 7²=49.

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