# number series

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

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

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

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

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

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

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

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

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

**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 ...