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18 questions from the electrical apprenticeship aptitude practice test.
10 questions, graded as you go, with the reason for every answer. No sign-up.
What number comes next in the series? 2, 3, 5, 8, 12, ...
A. 17
The amount added grows by one each time: +1, +2, +3, +4, so the next step is +5 and 12 + 5 = 17. Adding 4 again gives 16, which ignores the growing step.
Reference: Number series; increasing differences
What number comes next in the series? 81, 27, 9, 3, ...
Answer in (no unit).
1 (no unit)
Each number is the one before divided by 3: 81 ÷ 3 = 27, 27 ÷ 3 = 9, 9 ÷ 3 = 3. So the next is 3 ÷ 3 = 1.
Reference: Number series; constant ratio
What number comes next in the series? 1, 1, 2, 3, 5, 8, ...
Answer in (no unit).
13 (no unit)
Each term is the sum of the two terms before it: 1 + 1 = 2, 1 + 2 = 3, 2 + 3 = 5, 3 + 5 = 8. So the next is 5 + 8 = 13.
Reference: Number series; sum of the two previous terms