What is the next number that follows in the series?
$6,96,196,306,?$

Let's analyze the step differences between adjacent numbers in the sequence:
* $96-6=90$
* $196-96=100$
* $306-196=110$

The difference between the terms is increasing by exactly $10$ at each step ($90,100,110$).
Following this logic, the next difference value must be $110+10=120$.

$$\text{Next number}=306+120=426$$