PI Number Series Problems 4

Question 1

What is the next number: 120, 60, 20, 5, ___?

Accepted Answer

1.25

Answer

Divide by 2, then by 3, then by 4 — the next step divides by 4, so 5 ÷ 4 = 1.25.

Question 2

Find the missing number: 3, 6, 11, 18, ___, 38

Accepted Answer

27

Answer

Differences are 3, 5, 7, 9, 11 — odd numbers, so 18 + 9 = 27, and 27 + 11 = 38 confirms it.

Question 3

What comes next: 64, 32, 16, 8, 4, ___?

Accepted Answer

2

Answer

Each term is halved, so 4 ÷ 2 = 2.

Question 4

Complete the series: 2, 6, 18, 54, ___

Accepted Answer

162

Answer

Each term is multiplied by 3, so 54 × 3 = 162.

Question 5

What is the next term: 10, 10, 20, 60, 240, ___?

Accepted Answer

1200

Answer

Multiply by 1, 2, 3, 4, 5 — the next multiplier is 5, so 240 × 5 = 1200.

PI - Cognitive Assessment Practice Test