CogAT CogAT Quantitative Number Series 1 — Questions and Answers
Question 1: What number comes next in the series: 2, 4, 6, 8, __?
- 9
- 10 (Correct answer)
- 11
- 12
Correct answer: 10
Each number increases by 2, so after 8 comes 10.
Question 2: What number comes next in the series: 3, 6, 12, 24, __?
- 36
- 42
- 48 (Correct answer)
- 50
Correct answer: 48
Each number doubles the previous one, so 24 × 2 = 48.
Question 3: What number comes next in the series: 100, 90, 80, 70, __?
- 55
- 60 (Correct answer)
- 65
- 50
Correct answer: 60
Each number decreases by 10, so after 70 comes 60.
Question 4: What number comes next in the series: 1, 4, 9, 16, __?
- 20
- 25 (Correct answer)
- 21
- 24
Correct answer: 25
These are perfect squares (1², 2², 3², 4²), so the next is 5² = 25.
Question 5: What number comes next in the series: 5, 10, 20, 40, __?
- 60
- 70
- 80 (Correct answer)
- 75
Correct answer: 80
Each number is multiplied by 2, so 40 × 2 = 80.
Question 6: What number comes next in the series: 1, 1, 2, 3, 5, 8, __?
- 10
- 11
- 13 (Correct answer)
- 16
Correct answer: 13
Each number is the sum of the two before it (Fibonacci), so 5 + 8 = 13.
CogAT CogAT Quantitative Number Series 1
What number comes next in the series: 2, 4, 6, 8, __?