# Number Series Questions and Answers

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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

Look at this series: 80, 10, 70, 15, 60, ... What number should come next?

A. 20
B. 25
C. 30
D. 50

Explanation: This is an alternating addition and subtraction series. In the first pattern, 10 is subtracted from each number to arrive at the next. In the second, 5 is added to each number to arrive at the next.

Look at this series: 2, 6, 18, 54, ... What number should come next?

A. 108
B. 148
C. 162
D. 216

Explanation: This is a simple multiplication series. Each number is 3 times more than the previous number.

Look at this series: 5.2, 4.8, 4.4, 4, ... What number should come next?

A. 3
B. 3.3
C. 3.5
D. 3.6

Explanation: In this simple subtraction series, each number decreases by 0.4.

Look at this series: 1000, 200, 40, ... What number should come next?

A. 8
B. 10
C. 15
D. 20

Explanation: This is a simple division series. Each number is divided by 5.

#### Square and Cubic Conversion

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