CogAT CogAT Quantitative Number Series

Question 1

What number comes next in the series: 2, 4, 6, 8, __?

Accepted Answer

10

Answer

Each number increases by 2, so after 8 comes 10.

Question 2

What number comes next in the series: 3, 6, 12, 24, __?

Accepted Answer

48

Answer

Each number doubles the previous one, so 24 × 2 = 48.

Question 3

What number comes next in the series: 100, 90, 80, 70, __?

Accepted Answer

60

Answer

Each number decreases by 10, so after 70 comes 60.

Question 4

What number comes next in the series: 1, 4, 9, 16, __?

Accepted Answer

25

Answer

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, __?

Accepted Answer

80

Answer

Each number is multiplied by 2, so 40 × 2 = 80.

CogAT Practice Test