# number series

Look at this series: 31, 29, 24, 22, 17, ... What number should come next?

This is a simple alternating subtraction series, which subtracts 2, then 5.

Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?

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

Look at this series: 14, 28, 20, 40, 32, 64, ... What number should come next?

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

Look at this series: 2, 4, 6, 8, 10, ... What number should come next?

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

Look at this series: 201, 202, 204, 207, ... What number should come next?

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.

Look at this series: 544, 509, 474, 439, ... What number should come next?

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

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

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?

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?

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

Look at this series: 8, 6, 9, 23, 87 , ... What number should come next?

8 x 1 - 2 = 6
6 x 2 - 3 = 9
9 x 3 - 4 = 23
23 x 4 - 5 = 87
87 x 5 - 6 = 429 ...