20
The pattern is that each number equals to one tenth of the number before it. The number that will come next will be one tenth of 10, which is 1.
266
35
You are multiplying by 5 and taking 1 away, so the next value is 36719.
The number that comes next in the series 1 2 2 5 3 10 is 7. You get this number by subtracting the number 3 from the number 10.
6100
31
456789
12
Next is xx which is 20 xix = 10 + (10-1) = 19
20
22
1
0.1 These are all powers of 10: 10^3 = 1000 10^2 = 100 10^1 = 10 10^0 = 1 10^-1 = 0.1
9
8, 11, 12, 15...............