# Number Series Questions and Answers

Home > Numerical Tests > Number Series > Number Series Questions

Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters

Look at this series: F2, __, D8, C16, B32, ... What number should fill the blank?

A. A16
B. G4
C. E4
D. E3

Explanation: The letters decrease by 1; the numbers are multiplied by 2.

Look at this series: 664, 332, 340, 170, ____, 89, ... What number should fill the blank?

A. 85
B. 97
C. 109
D. 178

Explanation: This is an alternating division and addition series: First, divide by 2, and then add 8.

Look at this series: V, VIII, XI, XIV, __, XX, ... What number should fill the blank?

A. IX
B. XXIII
C. XV
D. XVII

Explanation: This is a simple addition series; each number is 3 more than the previous number.

Look at this series: 70, 71, 76, __, 81, 86, 70, 91, ... What number should fill the blank?

A. 70
B. 71
C. 80
D. 96

Explanation: In this series, 5 is added to the previous number; the number 70 is inserted as every third number.

Look at this series: 8, 43, 11, 41, __, 39, 17, ... What number should fill in the blank?

A. 8
B. 14
C. 43
D. 44

Explanation: This is a simple alternating addition and subtraction series. The first series begins with 8 and adds 3; the second begins with 43 and subtracts 2.

#### Square and Cubic Conversion

The largest provider of tests on the web. We have thousands of questions covering

numerical and verbal aptitude tests, diagrammatic and logic tests, reasoning tests,

puzzles, general knowledge test questions and GMAT test advice and questions.

No login required. All tests are free. All the tests you need when you need them.