Yes that is right that all games do not require mathematics, but still some gambling are there where mathematics is too much important and where without mathemmatics we cannot play gambling in a good way.
Not all of them but if you are good in Math there can be an effect to the way you think. It will make you think faster and reliable and when it comes to decisions you'll be at the best way to solve it. Like when we are solving Mathematical problems our minds are working well for sometime and not that good in other times, well it will help but not all the times but it's also good if you are good at it.