Direction In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much-
11.

Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?
A. 4.2
 B. 4.4
C. 4.7
 D. 5.1
Answer and Explanation
Answer: C

Explanation: In this simple addition series, each number increases by 0.8.




12.

Look at this series: 14, 28, 20, 40, 32, 64, ... What number should come next?
A. 52
 B. 56
C. 96
 D. 128
Answer and Explanation
Answer: B

Explanation: This is an alternating multiplication and subtracting series: First, multiply by 2 and then subtract 8.




13.

Look at this series: 2, 4, 6, 8, 10, ... What number should come next?
A. 11
 B. 12
C. 13
 D. 14
Answer and Explanation
Answer: B

Explanation: This is a simple addition series. Each number increases by 2.




14.

Look at this series: 201, 202, 204, 207, ... What number should come next?
A. 205
 B. 208
C. 210
 D. 211
Answer and Explanation
Answer: D

Explanation: In this addition series, 1 is added to the first number; 2 is added to the second number; 3 is added to the third number; 4 is added to the fourth number; and go on.




15.

Look at this series: 544, 509, 474, 439, ... What number should come next?
A. 404
 B. 414
C. 420
 D. 445
Answer and Explanation
Answer: A

Explanation: This is a simple subtraction series. Each number is 35 less than the previous number.