Here are some FREE web site based games to help improve your number skills - click to try:-
This collection is likely to be from the US and provides links to other subjects - but take care to avoid misleading adverts for IXL Maths - a chargeable service.
That quiz is a web site for numbers and other stuff. Although it gives the impression that you need to be a member to use it - YOU DON'T!
Former DofE learning site adult friendly
Free Shut the Box game
Some tell the time worksheets HERE and more HERE and HERE
A days in the month worksheet HERE
Giving change HERE
Primary logic & other stuff HERE
Fractions etc worksheets HERE
Lots of worksheets/ flash cards (inc online & times tables) HERE